Audi 80 The third generation has been produced since 1986 in a round, fully galvanized body for corrosion protection, with a soft wedge shape. The year of manufacture of the car is quite old, so the likelihood of problems with electrics or appliances is high.

In the event of an emergency situation associated with electrical appliances, you should first check the integrity of the fuses and relays Audi 80. This article will help you.

Fuse box and relay Audi 80 B3:

Fuses and relay Audi 80 located in the niche of the engine compartment, near the right pillar and protected by a cover.

Location and description of the block components:

Block fuses:

1. (15 A) - Front fog lights, rear fog light
2. (15 A) - Alarm
3. (25 A) - Horn, brake light, cruise control system(clutch and brake pedals; 1986-1988 models only)
4. (15 A) - Clock, trunk lighting, interior lighting, rear-view mirror, socket, cigarette lighter, radio, on-board computer, air conditioning control unit
5. (30 A) - Radiator cooling fan - full speed
6. (5 A) - Parking lights on the right side
7. (5 A) - Parking lights on the left side
8. (10 A) - Right headlight high beam, signal lamp for switching on high beam headlights
9. (10 A) - Left headlight high beam
10. (10 A) - Right low beam headlight
11. (10 A) - Left low beam headlight
12. (15 A) - instrument panel, taillights, differential lock, automatic control system, cruise control system (control unit), ABS, control box cooling fan, 4-speed automatic transmission(since 1990)
13. (15 A) - Fuel pump
14. (5 A) - License plate lights, engine compartment and glove box lights, instrument cluster lights
15. (25 A) - Windshield wipers, direction indicators, air conditioning, sprinkler heaters(since 1989)
16. (30 A) - Heater rear window, rearview mirror defroster
17. (30 A) - Cabin / stove / air conditioning fan
18. (5 A) - Power rear-view mirrors, rear window wiper(since 1990)
19. (10 A) - System central lock, door lock heater (since 1989), anti-theft system(since 1990)
20. (30 A) - Radiator cooling fan - low speed, delay relay
21. (25 A) - Rear cigarette lighter(until 1990)
    Diagnostic unit(since 1990)
22. Reserve
23. (30 A) - Passenger seat position adjuster, driver seat position memory switches
24. (10 A) - Ignition advance I(ECU system KE-Jetronic and Motronic) (until 1989)
    Speed ​​control system (since 1989)
    Reserve(since 1990)
25. (30 A) - Seat heater
26. Reserve(until 1990)
    License plate light, daytime driving warning lights (since 1990)
27. (10 A) - Reserve(until 1989)
    Ignition advance I(since 1989)
28. (15 A) - Ignition advance II(Engine system ECU)
29. Reserve(since 1990)
30. (5 A) - System for maintaining a constant speed(for models with 4-speed automatic transmission) (since 1990)

Block Relay:

1. Fog lamp relay
2. Engine Cooling Fan Relay ( high speed) (until 1990)
   Reserve (since 1990)
3. Relay for turning on the engine cooling fan when the engine is not running
4. Reserve (until 1990)
   Headlight washer relay (since 1990)
5. Unloading relay
6. A/C relay (before 1990)
   Engine Cooling Fan Relay (High Speed) (since 1990)
7. Horn relay
8. Automatic transmission relay (or jumper on vehicles with manual transmission)
9. Windscreen wiper and washer intermittent relay
10. Relay fuel pump
11. Engine Cooling Fan Relay (Low Speed)

Additional relay box in the cabin:

An additional cabin relay box is located under the driver's seat shelf. Additional relays or control units can be installed, the first six slots are provided by default. To the right of them are detachable cable contact panels.

Location of the main and additional contact cells:

Relay purpose:

1. ABS relay
2. Seat Belt Warning Relay
3. Interior lighting relay
4. A/C Clutch Relay
5. Reserve (until 1990)
   From 1990: Windshield washer relay
6. Relay for headlights
7. Reserve
8. Reserve
9. Reserve (until 1990)
   Relay automatic lock gear shifting (since 1990)
10. Reserve
11. Reserve
12. Reverse current relay (power seats, power mirrors) (until 1990)
    Reserve (since 1990)
13. Passenger Seat Heater Relay
14. Driver Seat Heater Relay
15. The relay of the electric drive of the sunroof and windows
16. Light relay anti-theft system
17. Reverse current relay (electric seats and rear-view mirrors) (since 1990)

Audi 80 B3 Owner's Manuals:

If you have experience in repairing, troubleshooting, or information on this topic, leave your comment below, useful information will be added to the article.

Body electrical system

Just don't be afraid of the numerous wires, plugs and fuses in the Audi 80! You will quickly find your bearings thanks to the fuse table and various wiring diagrams in this and the following chapter.

Minus the "mass" Audi 80

Minus to "mass"

The current consumers are supplied with power by means of a wire, which is always connected to the battery in a more or less complicated way, as can be seen from the wiring diagrams in the next chapter.

The return circuit is provided by electrically conductive metal elements of the body or engine. This saves a lot of expensive copper cable. In most cases, a short length of cable is still needed for the return circuit - namely, where the consumer of electricity is not located directly on the metal. To do this, there is - distributed throughout the body - a certain number of so-called "mass" points.

The negative pole of the battery is also, of course, connected to the body, "ground", as auto electricians say. So remember - "minus the mass."

Orientation in the electrical system Audi 80

Orientation in the electrical system

Terminal designations

The motley mix of wires in a car is actually very streamlined, because many of the details of a car's electrical system are standard. Numbers on various details and cable connections, as well as in wiring diagrams, have the same meaning in all German and in some foreign cars.

Terminal 15 receives power from the ignition switch only when the ignition is on, and in addition to the ignition coil, power is also supplied to those current consumers who should receive it only during the direct operation of the vehicle. The wires to terminals 15 are black sheathed, sometimes with additional colored stripes.

Terminal 30 is continuously powered by the positive battery terminal or, with the engine running, by the alternator. Rough handling of tools can cause short circuits and sparks if the negative battery terminal is not disconnected. This permanently energized wire has a red sheath, optionally with additional colored stripes.

Terminal 49 is responsible for the turn and hazard warning lights.

Terminal 53 supplies power to the windshield washer system.

Terminal 56 is responsible for supplying power for the low beam (yellow and yellow-black wires) and for the high beam with white (white-black wires).

Terminal 58 is needed for the front parking light (dimensions), as well as for the rear position lights and number plate lights. The main color of the wire sheath is gray, respectively, with additional colored stripes.

Terminal 31 is the body terminal, or “ground”, with which the power consumer must be connected to the car body in order for the electrical circuit to be closed. Corresponding wires are provided with a brown sheath.

Designation of electrical connectors

The individual wires are often bundled in the Audi 80 in large black-sheathed bundles, making it difficult to find a specific wire. Orientation assistance in this case can be obtained from numerous multi-pin plug connections, the number of wires in which and their exact position are indicated in the wiring diagrams in the next chapter.

Audi 80 wires

The cross section of the wire is selected depending on the magnitude of the current of the corresponding consumer: the indicator light needs a wire 0.5 mm 2 thick, while the starter needs a 15 mm wire. Too thin wire heats up, and the voltage drops. In this case, instead of the required 12 V, only 10 or 9.5 V are supplied to the headlights - the lighting becomes dim.

Audi 80 plug connections

Plug connections

For a long time, in the statistics of malfunctions of the General Automobile Club of Germany (ADAC), loose plug connections were noted as one of the most common causes of malfunctions - and in almost all cars.

Now Audi has put an end to this in the literal sense of the word: almost all plug-in connections are equipped with additional mechanical protection.

This protection must be overcome before disconnecting the plug. The most common types of plug protection are listed below.

• The injection system plugs are protected by a wire clip that must be pressed down.
• Many multi-pin plugs have security latches on the sides that must be pressed in before the plug can be removed.
• For example, on the instrument cluster unit there are multi-pin plugs protected by a plug-in bracket.

Audi 80 central switch

Central switch

The central switch is located in the Audi 80 in a waterproof housing under the windshield. It can hold up to 31 fuses (one more if the vehicle is equipped with a diesel engine), four backup fuses, and a total of eleven relays. In addition, there is also a plug connection for connecting a diagnostic tool.

1 - relay for fog lights and tail lights, bridge, if the car is not equipped with fog lights;
2 - cooling system fan relay (models not equipped with air conditioning), relay for the second cooling system fan;
3 - control unit for turning on the fan after the engine stops working; 4 - control unit of the headlight cleaning system;
5 - unloading relay X-contact.

6 - fan relay (on models with manual air conditioning), relay of the second fan of the cooling system (on models with automatic air conditioning and some engine options);
7 - the relay of a sound signal;
8 - alarm system relay (on models with a manual gearbox), bridge on models not equipped with an alarm system. On models equipped with automatic transmission, this place remains empty; 9 - intermittent relay of the wiper / washer system;
10 - fuel pump relay;
11 - relay of the first fan of the cooling system.

All wires in the Audi 80 are assembled into various bundles. They all end in the so-called central switchboard, a black box located at the back left in engine compartment in a waterproof case. It can accommodate 21 fuses, ten additional fuses, four backup fuses and a range of relays.

Replacing the central switch

If, during troubleshooting, it was found that the cable connections, the corresponding fuse or relay are not damaged, then the central switch may also be the cause of the malfunction. Typical damage could be loose contacts or temperature related failures. In this case, the central switch must be replaced.

1. As a spare part, you must purchase the corresponding version of the central switch.
2. Open the lid and detach the hinges.
3. Press on the fixing brackets on the right and left of the plug-in element - the central switch itself and pull out the plug-in element with the wires connected.
4. Switch the plugs one by one from the old to the new device.
5. Place the insert element back into the frame.
6. Remove the shelf on the left under the dashboard and check if all the wires have been switched.

the cover of the central switch must be closed, otherwise drafts will walk along the driver's legs while driving.

Additional relay box Audi 80

Additional relay box

Relays or control units for which there was no place in the central switch are located in the relay box under the dashboard. They become accessible after removing the shelf on the left under the dashboard. The location of the contact cells is shown in the figure below. Additional, not found everywhere, adapters are also noted there.

Relays and control units Audi 80

Relays and control units

Look under backseat Audi 80 sedan version

1 - differential lock control unit (only all-wheel drive models);
2 - longitudinal acceleration switch anti-lock braking system(only all-wheel drive models); 3 - control unit anti-lock braking system;
4 - additional relay block.

The on-board electrical system includes a number of relays and control units located in the central switch or on an additional relay box on the left under the dashboard or under the rear seat.

A simple switching relay is used primarily for powerful current consumers. This has the following reason: if power is supplied through long cable lines through appropriate switches, then voltage losses will be the consequence. In addition, the contacts of the switches are heavily stressed due to the higher current. With a relay circuit, the switch is used only for low current, and not the current consumer is connected directly, but its relay.

If the switching command does not come from the switch, but from the control unit, then the picture is the same: sensitive electronic elements cannot conduct high currents without damage to themselves.

• Certain relays may perform additional functions. For example, the turn signal relay switches on flashing pulses, and the windshield washer and wiper relay controls the intermittent operation and operation without water of the wiper after washing the windows.
• The control units are equipped with more or less complex electronic systems for certain functions, sometimes a relay is installed in them. Examples include the power window control unit or the passenger compartment light delay control unit.

Operating principle of the switching relay

• When the corresponding power consumer is switched on, the electrical circuit is closed in the relay from terminal 86 (incoming "switching current") to terminal 85 (housing).
• Due to this, the electromagnet, overcoming the resistance of the spring, attracts a powerful contact and thus closes the electrical circuit for the "working current".
• To prevent voltage losses, the operating current is conducted according to the shortest way directly to terminal 30 of the relay and from there further - provided that the contacts are closed through terminal 87 to the power consumer.
• Sometimes there is also terminal 87 a. It is rigidly connected to terminal 87, that is, it performs the same function.

Troubleshooting switching relays

1. There must always be voltage at terminal 30, unless it is a relay whose consumer is dependent on another consumer. Example: Voltage at the rear relay fog lamp only comes on when the light is on.
2. To check the presence of voltage, remove (pull out) the relay and touch the needle electrode of the control light to terminal 30 in the relay base. No voltage means broken wire.
3. Remove the relay, connect terminal 86 to the positive pole of the battery, and terminal 85 to the housing ("ground"). The electromagnet coil must clearly (audibly) attract the relay contact, otherwise the relay is faulty.

Help with defective switching relay

1. Remove relay from socket.
2. Connect terminals 30 and 87 in the relay cell with a paper clip or a short piece of wire. Thanks to this, the respective consumer will receive D.C..
3. To disable this jumper, remove this jumper, since the corresponding switch in this case bypassed.

Contact X unloader relay Audi 80

Unloading relay contact X

In the on-board electrical system, the contact X relief relay (a simple switching relay, by the way) plays a significant role. Therefore, the principle of its operation is described here.

Contact X of the ignition switch is only energized when the ignition key is in the "Trip" position. Powerful current consumers, such as a windscreen wiper, heated rear window or fan, are connected through this terminal so that when the engine is started, all the “power” of the battery goes to the starter. Of course, not all of these consumers can receive their power through a contact in the ignition switch; he is too weak for that. Therefore, a relay must be connected between them, and power is supplied through it. The ignition switch contact (along with the power supply for the headlights) is only responsible for the switching current to the relay.

Audi 80 fuses

Circuit breakers

Every electrical device in a car needs a certain set amount of current. According to this current, the cross section of the wire leading to the device is also determined.

If in this electrical circuit the current rises, for example, due to the appearance of additional consumers or due to a short circuit, then this wire is overloaded. At the same time, it may heat up slightly or even begin to heat up if the current flow is not interrupted in a timely manner. That's what fuses do. As already noted, in order for the Audi car not to be completely without power in the event of a defect in the electrical circuit, the fuses are distributed in various electrical circuits. However, the connections between the battery, alternator, starter and ignition switch are not protected by fuses.

Replacing fuses

1. If one of the fuses needs to be replaced, you can use the small plastic pliers attached to the cover of the central switchgear to disconnect.
2. If the new fuse immediately blows again, check to see if a too weak fuse has been installed.
3. If the fuse has been selected correctly, it is necessary to identify the connected current consumers on the basis of the fuse table and check each of them individually. An appropriate wiring diagram will also help.
4. In case of doubt, disconnect all consumers and connect them one by one, one by one. The consumer, when connected to which the fuse blows, is defective.

Additional fuses

On certain versions with optional equipment, the optional central switch unit contains additional fuses. These are those that are listed in the fuse table under numbers 23 - 28.

Number 22 is only on vehicles with a diesel engine. Also on this panel, some versions have fuses for the ignition and injection systems. The red cover with the inscription "Motor-Moteur" serves as protection for this.

fuse table Audi 80

Fuse table

	Connected consumers
	Fog lights, rear fog lights
	Emergency light signaling
	Horn, heated seats
	Clock, luggage compartment light, vanity mirror, reading light, socket/cigarette lighter, trip computer, full automatic air conditioning, radio, Auto-Check-System
	Second stage cooling fan speed
	Right rear marker light, front marker light
	Left side tail light, front side light
	Right headlight high beam, high beam indicator
	High beam left headlight
	Dipped beam on the right, headlight range control motor on the right
	Dipped beam left, headlight range control motor left
	Instrument Cluster, Reversing Lamp, Auto-Check-System, Automatic Transmission, Differential Lock, Trip Computer, Cruise Control System, Delayed Interior Lamp, Electronic Thermal Switch, Cooling Fan Operation After Engine Shutdown
	Fuel pump
	License plate light, instrument light, engine compartment light, lighting glove box, automatic air conditioning
	Direction indicators, windshield wipers, washer pump, heated washer nozzles, cooling fan (control unit for turning on the cooling fan after the engine stops), air conditioning
	Heated rear window, heated exterior mirrors
	Fan, automatic air conditioning
	Electric adjustment of external rear-view mirrors, rear window washer (station wagon)
	Central locking system, door opener cylinder heating, alarm
	The first stage of the fan of the cooling system, turning on the fan after the engine stops
	Self-diagnosis/diagnostic tool connection
	free

The power windows, the power sunroof and the power seat adjustment are equipped with automatic fuses, which automatically reactivate after the fault has been corrected. The fuse adapters are located to the left of the additional fuse box on the left under the dashboard.

	Connected consumers
	free
	free
	Heating lambda probe
	trailer socket
	Ignition/injection system
	Ignition/injection system
	Stop signal
	Speed ​​control system combined with automatic transmission transmission, ABS, differential lock
	Ignition/injection system

Fuses 27 and 28 are provided with a red plastic cover with the inscription "Motor/Moteur".

Wiring diagrams Audi 80

Electrical circuits

Wiring diagrams separate electrical circuits of the system next to each other, so that the functional interdependence becomes more explicit and understandable. However, the passage of wires in the car cannot be understood from these images.

What you need to know about electrical circuits

Distribution

Below you will find parts of the wiring diagrams that always show only one specific vehicle group. The purpose of this distribution is to save space. After all, the area of ​​the wiper system applies to both vehicles with a 66 kW engine and vehicles with a 128 kW engine. So choose for yourself exactly the area with which you are going to deal with at the moment.

Building

Wiring diagrams are divided into many circuits, numbered at the bottom of the diagram. Thus, based on the explanation of the wiring diagram, you can easily find the individual elements. The bottom line indicates the "mass" of the car (that is, the metal of the body), through which the electrical circuit is closed. The gray box at the top edge of the diagrams shows the central switch. The designation of the plug contacts indicates where the wire is connected. Example: B15 means that this wire should be found in the multi-pin plug on connection B of the central switch.

If a wire ends in a rectangular frame that contains a number - for example, 15 - then you will find the continuation of this wire in the named electrical circuit number, in the example it is circuit number 15.

Wire colors

In wiring diagrams, wire colors are given as abbreviations. Abbreviations denote: sn - blue; k - brown; g - yellow; h - green; cf - gray; l - lilac; kr - red; h - black; b - white.

Additionally, in conclusion, wiring diagrams of other engines are given, which, if necessary, should be mentally integrated into the mentioned complete wiring diagram.

In conclusion, electrical diagrams are given for this. additional elements equipment, such as fog lights.

The image shows the central switch board from below. It is divided into sockets of plug contacts, into which one multi-pin plug is inserted, respectively, and which are marked with letters of the Latin alphabet. Additionally, terminal designations are indicated. You will find both of these designations on the wiring diagrams at the bottom of the gray box, which should represent the central switch. According to these data, you should look for a cable in the central switch.

Complete Wiring Diagram of an Audi 80: 2-liter 4-cylinder engine (66 kW) Audi 80

Complete wiring diagram of an Audi 80: 2-litre 4-cylinder engine (66 kW)

Battery, starter, three-phase generator alternating current, intake manifold preheating

Wire colors: ro - red, sw - h, ro / sw - red / h, bl - sn, ro / ws - red / b, sw / ro - black / red, sw / bl h / s, sw / ge - b/w.

Fuel Pump, Injection System, Mono-Motronic Injection System Control Unit

Wire colors: br - k, gn / ge - s / w, ws / gn - b / s, ws / bl - b / kr, ro - kr, br / gr - k / cf, sw / li h / l, br / li - c / l, bl / br - sn / c, gn - c, br / ro - c / c, bl / gn - c / c, gn / ro - / kr, gn / sw - c / h , gn/gr – s/s, gn/bl – s/s, sw/ws – b/w.

Heated Lambda Sensor, Activated Carbon Solenoid Valve, Throttle Position Control

Wire colors: br - k, br / ge - k / w, bl / sw - dn / h, gn / sw - s / h, sw - h, gr / sw md / h, ro / ge - red / w, gr/ws sr/b, sw/ro – b/c, ge – w, br/sw – k/h, sw/bl – b/s, li/sw – l/h, li – l, ro/sw kr/h

AND - accumulator battery
B - starter
C - three-phase alternator
C 1 - voltage regulator
J81 - Exhaust manifold preheating relay ("hedgehog")
L51 - heating resistor for heating the exhaust manifold ("hedgehog")
T1 - 1-pin plug connection at the front right
T 1p - Single-pin plug connection near the exhaust manifold
T 1q - 1-pin plug connection on the left behind the instrument panel
(6) - flexible jumper, engine - generator
(11) - point of "mass" at the battery socket
G 6 - fuel pump
G 42 - intake air temperature sensor
G 62 - coolant temperature sensor
G 69 - Throttle valve potentiometer
J 17 - fuel pump relay

L 30 - injection nozzle of the first cylinder
T 2x - Black 2-pin plug connection in an airtight housing close to the relay plate (diagnostic plug connection)
T 2y - 2-pin plug connection of blue color near the relay plate (plug connection for diagnostic tools)
T 2z - 2-pin plug connection white color near the relay plate (plug connection for diagnostic tools)
T 4f - Brown 4-way connector, left in engine compartment
T 10 - black 10-pin plug connection, plug-in station in additional relay box
(17 - point of "mass" on the intake manifold
(50) - point of "mass" on the left in the luggage compartment
(83) - ground connection (housing) - 1 - in the electrical circuit in front on the right
(D 8) - connection (temperature sensor / potentiometer) in the electrical circuit at the front right
* - resistive wiring 3 ohm
K - electrical circuit distributor for the diagnostic plug (K-circuits)
L - electrical circuit distributor for the diagnostic plug (L-circuits)

G 39 - lambda probe
J 257 - Mono-Motronic injection system control unit
L 80 - solenoid valve of the tank 1 with activated carbon (pulse)
S 25 - separate fuse for heating the lambda probe (in the additional fuse box)
S 27 - separate fuse for Mono-Motronic injection system (engine management) and ignition coils (in additional fuse box)
T 1a - 1-pin plug connection on the right in the engine compartment
T 2x - two-pin black plug connection in a waterproof housing near the relay plate (diagnostic plug)
T 5 - black 5-pin plug connection, plug-in socket in auxiliary relay box
V 60 - throttle position controller
Z 19 - heated lambda probe
(17) - point of "mass" on the exhaust manifold
(83) - ground connection (housing) - 1 -, in the electrical circuit in front on the right
(84) - connection to "ground", engine housing, in the electrical circuit in front on the right

Hall sensor, high voltage transformer, ignition distributor, Audi 80 spark plugs

Hall sensor, high voltage transformer, ignition distributor, Audi 80 spark plugs

Hall sensor, high voltage transformer, ignition distributor, spark plugs

G 40 - Hall sensor
L 152 - high voltage transformer
O - ignition distributor
P - wire tip to the spark plug 17 - ground point on the intake manifold
84 - connection to the "mass" (engine housing), in the electrical circuit in front on the right
Q - spark plugs

Ignition and starter switch, contact X relief relay, fuel tank damping Audi 80

Ignition and starter switch, contact X overload relay, damping fuel tank

J59 - Contact X unloading relay
*J273 - Damping/fuel gauge control unit


81 - connection to "ground" - 1 in the circuit to dashboard A2 - positive connecting line (15), in the circuit to the dashboard
A17 - connecting line (61) in the circuit to the dashboard
A21 - connecting line (86s) in the circuit to the dashboard
A33 - connecting line (75) in the circuit to the dashboard
A41 - positive connecting line (50) in the circuit to the dashboard
* - only for all-wheel drive models

Coolant fan, thermal switch for fan Audi 80

Coolant fan, thermal switch for fan

F18 - coolant fan thermal switch
J101 - Cooling fan speed 2 relay T3f - Green 3-pin plug connection, left behind instrument panel
V7 - coolant fan

Headlights, parking light, tail lights, brake light, reversing light Audi 80

F - brake light switch
F4 - reverse light switch
L1 - double-filament lamp of the left headlight
L2 - double-filament lamp of the right headlight
M1 - Parking lamp, left
M2 - tail light bulb on the right
M3 - parking light bulb right
M4 - tail light bulb, left
M6 - turn signal lamp rear left
M8 - Turn signal lamp, rear right M9 - Brake lamp, left
M10 - brake light bulb right
M16 - Reversing lamp, left
M17 - right reverse lamp
S29 - separate fuse for brake light (in the additional fuse box)
T1f - Black single-pin connector behind the dashboard on the left
T4 - 4-pin connector, near the headlights on the left
T4a - 4-pin connector, near the headlights on the right

Light switches, dipped beam switches, headlight high beam and parking light switches Audi 80

Light switches, low beam switches, light signal high beam headlights and parking light

T6b - Black 6-pin connector in the luggage compartment on the left
T10b - brown 10x plug connection, plug in auxiliary relay box
(50) - point of "mass", luggage compartment left


(A18) - connecting line (54) in the electrical circuit to the dashboard
є1 - light switch
є4 - switch for low beam headlights and high beam headlights є19 - switch for parking lights
(A9) - positive connection line (56b) in the electrical circuit to the dashboard
(A32) - positive connecting line (30) in the electrical circuit to the dashboard
(A43) - connecting line (57L) in the electrical circuit to the dashboard
(A44) - connecting line (57r) in the electrical circuit to the dashboard
– only for vehicles exported to Italy

Glove box lighting, luggage compartment lighting, license plate lighting, engine compartment lighting Audi 80

Glove box lighting, luggage compartment lighting, license plate lighting, engine compartment lighting

F5 - luggage compartment light switch
L29 - engine compartment light bulb
T6 - 6-pin black plug connection, plug-in socket in auxiliary relay box
T6b - Black 6-pin connector, in left luggage compartment
T10b - brown 10-pin plug connection, plug-in station in additional relay carrier
W3 - Luggage compartment light
W6 - Glove box light X - License plate light
(81) - connection to "ground" - 1- in the electrical circuit to the dashboard
(98) - ground connection in the electrical circuit to the trunk lid
(A7) - positive connecting line (58 D1) in the electrical circuit to the dashboard
(A20) - connecting line (15a) in the electrical circuit to the dashboard
* only on version with heated washer/headlight washer jets

Audi 80 flashing direction indicators and hazard warning lights

Flashing turn signal and hazard warning light system

E2 - turn signal switch
E3 - Hazard Light Switch
J2 - hazard warning light relay
M5 - turn signal lamp front left
M7 - front right turn signal lamp
T10a - 10-pin yellow plug connection, plug-in socket in auxiliary relay box
(81) - connection to "ground" - 1 in the electrical circuit to the dashboard
(119) - ground connection - 1 in the electrical circuit to the headlights (A5) - positive connecting line (right turn signal) in the electrical circuit to the dashboard
(A6) - positive connecting line (left turn signal) in the electrical circuit to the dashboard
E22 - Intermittent wiper switch
H - sound signal drive
H1- sound signal/two-tone beep
J4 - two-tone horn relay
J31 - windscreen wiper/washer relay
J39 - Headlamp washer relay

Wiper/wash system, headlight cleaning system, heated washer jets, Audi 80 horn

Wiper/wash system, headlamp cleaning system, heated washer jets, horn

T1i - 1-pin white plug connection behind the instrument panel on the left
T2f - 2-pin plug connection near the cleaning nozzle
T2g - 2-pin plug connection near the wash nozzle
T3 - Black 3-pin connector, behind the instrument panel on the left
T6 - black 6-pin plug connection, plug-in station in additional relay box
V - wiper motor
V5 - windshield washer pump
V11 - Pump for headlight cleaning Z20 - Heating resistor for left injector
Z21 - heating resistor for right injector
(32) - point of "mass", behind the dashboard on the left

(119) - ground connection (housing) - 1 in the electrical circuit to the headlights
E20 - Dimmer - switches and instruments
G - fuel quantity indicator sensor
G5 - tachometer
K6 - warning light indicator

Instrument cluster, tachometer, digital clock, Audi 80 dimmer

Instrument cluster, tachometer, digital clock, dimmer

K64 - Hazard and turn signal indicator, right
K65 - Left turn signal indicator
L8 - clock backlight
T6b - 6-pin black connector in luggage compartment, left T26 - 26-pin yellow connector, in dash panel insert

Y2 - digital clock
(98) - connection to "ground" (body) in the electrical circuit to the trunk lid

Instrument cluster, voltage stabilizer, coolant control, fuel gauge, Audi 80 speedometer

Instrument cluster, voltage stabilizer, coolant control, fuel gauge, speedometer

G1 - fuel quantity indicator
G3 - coolant temperature indicator
G21 - speedometer
G22 - speedometer sensor
J6 - voltage regulator
K1 - high beam indicator
L10 - instrument cluster illumination lamp (6x)
T10 - 10-pin black plug connection, plug-in socket in auxiliary relay box
T26 - Yellow 26-pin connector, in dash panel insert
T26a - Blue 26-pin connector, in dash panel insert
(81) - ground connection - 1 in the electrical circuit to the dashboard (83) - ground connection - 1 in the electrical circuit in front on the right
(A42) - connecting line (fuel quantity indicator) in the electrical circuit to the dashboard
* only for all-wheel drive models
F1 - hydraulic switch (1.8 bar)
F9 - parking brake warning switch
F12 - starting device control contact
F14 - coolant temperature control switch (temperature too high)
F22 - hydraulic switch (0.3 bar)
F34 - brake fluid level signal contact
F66 - coolant indicator switch
G2 - coolant temperature indicator sensor
G14 - voltmeter

Instrument cluster, mini-check-system, oil pressure control, coolant control Audi 80

Instrument cluster, mini-check-system, oil pressure monitoring, coolant monitoring

J268 - mini check system control unit
K2 - generator indicator
K14 - parking brake indicator
K15 - trigger indicator
T3 - 3-pin black plug connection behind the instrument panel on the left

T5c - 5-pin plug connection, instrument cluster - mini check system
T6g - 6-pin connector, instrument cluster - mini check system
T10 - 10-pin black connector, plug-in socket in additional relay box T10b - 10-pin brown connector, plug-in socket in additional relay box
T14 - 14-pin white connector, instrument cluster (mini check system)
T26 - 26-pin yellow connector in instrument cluster
T26a - Blue 26-pin connector in dash panel insert
(81) - connection to "ground" (housing) - 1 in the electrical circuit to the dashboard
(83) - connection to "ground" (housing) - 1 in the electrical circuit in front on the right
(119) - ground connection (housing) - 1 in the electrical circuit to the headlights
(A10) - connecting line in the (preheat control) electrical circuit to the instrument panel

Fog lights, fog tail lights, parking light control Audi 80

(A24) - connecting line (brake system control) in the electrical circuit to the dashboard
(A45) - connecting line (speed signal) in the electrical circuit to the dashboard
E7 - fog light switch
E18 - rear fog light switch
J5 - fog lamp relay
*K4 - parking light indicator
L20 - rear fog lamp
L22 - fog light bulb on the left
L23 - fog light bulb right
T2l - 2-pin black connector, in the engine compartment on the left
T2m - 2-pin black connector, in the engine compartment on the right T6b - 6-pin black connector, in the luggage compartment on the left
T10a - 10-pin black plug connection, plug-in socket in auxiliary relay box
T10b - brown 10-pin plug connection, plug-in socket in auxiliary relay box
(81) - connection to "ground" (housing) - 1 in the electrical circuit to the dashboard
(98) - connection to "ground" (body) in the electrical circuit to the trunk lid
(119) - ground connection (housing) - 1 - in the electrical circuit to the headlights
(A3) - positive connecting line (58) in the electrical circuit to the dashboard
(A47) - connecting line (55) in the electrical circuit to the dashboard
* - only for cars exported to Italy

Cabin ventilation system, cigarette lighter Audi 80

Cabin ventilation system, cigarette lighter

E9 - interior ventilation switch
L16 - backlight bulb for regulating the supply of fresh air to the passenger compartment
L28 - cigarette lighter light bulb
L24 - additional resistance of the interior ventilation system with overheating protection
T3c - brown 3-pin plug connection, behind the dashboard in the middle
U1 - cigarette lighter V2 - interior fan
(81) - connection to "ground" (housing) - 1 in the electrical circuit to the dashboard
(A19) - connecting line (58d) in the electrical circuit to the dashboard
(A34) - connecting line (75x) in the electrical circuit to the dashboard
F2 - Front left door light switch with contact for buzzer

Door light switch, interior lighting, audi 80 vanity mirror

Door light switch, interior lighting, vanity mirror

F3 - door light switch, front right
F10 - rear left door light switch
F11 - rear right light door switch
T2e - 2-pin plug connection near interior light bulb
Tsb - green 3-pin plug connection, behind the instrument panel on the left
T5a - 5-pin brown connector, plug in auxiliary relay box W - front interior light
W14 - illuminated vanity mirror (front right)
W20 - illuminated vanity mirror (driver's side)
(81) - ground connection - 1, in the electrical circuit to the dashboard
(A23) - connecting line (30al), in the electrical circuit to the dashboard

Heated rear window, radio Audi 80

Heated rear window, radio

A26) - connecting line (door light switch / driver's side), in the electrical circuit to the dashboard
*only with illuminated vanity mirror
E15 - rear window heating switch
R - connection for radio
T10 - brown 10-pin plug connection, plug-in socket in auxiliary relay box
Z1 - heated rear window
(81) - connection to "ground" (housing) - 1, in the electrical circuit to the dashboard
(A27) - connecting line (speed signal), in the electrical circuit to the dashboard
(A46) - positive connecting line (30 - from the radio), in the electrical circuit to the dashboard

2-liter 4-cylinder engine (85 kW) Audi 80

2-liter 4-cylinder engine (85 kW)

Electronic injection system, lambda control, knock control

G39 - lambda probe
G61 - knock sensor I
J169 - Digifant control unit
J176 - Power supply relay for the Digifant control unit
S25 - Separate lambda probe heating fuse
T1a - 1-pin plug connection, on the right in the engine compartment
T2x - 2-pin black plug connection, in a waterproof housing near the relay plate (diagnostic plugs)
T2z - white 2-pin plug connection, in a waterproof housing near the relay plate (diagnostic plugs) T3l - green 3-pin plug connection for the left knock sensor
T5 - 5-pin black plug connection, plug-in socket in auxiliary relay box
Z19 - lambda probe heating
(17) - point of "mass" (housing) on ​​the intake manifold
(83) - connection to "ground" (housing) -1, in the electrical circuit in front on the right
* - only for models with gearbox
** – only for models with automatic transmission
G6 - fuel pump
G18 - temperature sensor

Electronic injection system, fuel pump relay, Audi 80 fuel pump

Electronic injection system, fuel pump relay, fuel pump

Wire colors: br/sw - c/h, br - c, br/ro - c/c, gl/ro - c/c, gl/ge - c/f, ge/ws - reinforced concrete, li - l , gl/sw – s/h, gl/gr – s/sn, ws/bl – b/sn, gl/bl – s/sn, ro/sw – kr/h, ro/bl – kr/sn.

(D11) - positive connection line (15) through fuse 28 in the electrical circuit at the front right
G6 - fuel pump
J17 - fuel pump relay
J192 - Multipoint injection control unit
L80 - solenoid valve 1 for activated charcoal tank system (pulsed)
L156 - Intake manifold sequence valve
R - connection for radio
S28 - fuse in the auxiliary fuse box (engine control II - lambda control)
T2x - 2-pin black plug connection, watertight cover near the relay plate (diagnostic plugs)
T2z - 2-pin white plug connection, watertight cover near the relay plate (diagnostic plugs)
(17) - ground point, on the intake manifold (50) - ground point, luggage compartment on the left
(83) - connection to "ground" (housing) - 1-, in the electrical circuit of the engine compartment on the right
(84) - connection to "ground" (housing), engine housing, in the electrical circuit of the engine compartment on the right
(124) - connection to "ground" (housing), in the electrical circuit of the engine compartment on the right
(A27) - connecting line (high speed signal), in the electrical circuit to the dashboard
(D11) - positive connecting line (15) through fuse 28 in the electrical circuit of the engine compartment on the right
K - wiring distributor for the diagnostic plug (K-line)
L - wiring distributor for the diagnostic plug (L-line)
Note: The wiring distributors are screwed to the frame of the relay box (in a waterproof housing).
D - ignition and starter switch

Audi 80 central locking system, interior lighting with switch-off delay and vanity mirror lighting

Central locking system, delayed switch-off interior lighting and vanity mirror lighting

Wire colors: br - k, br / ws - k / b, br / ge - k / w, gl / bl - s / sn, ge / bl - w / sn, ro / sw - red / h

F2 - front left door limit switch
F3 - front right door limit switch
F10 - rear left door limit switch
F11 - rear right door limit switch
F59 - Central locking switch (driver's side)
F114 - central locking switch (right side)
J152 - signal buzzer for parking light and radio
J268 - mini autocheck control unit
T5a - 5-pin brown plug connection, plug-in socket in auxiliary relay box
T14 - 14-pin white connector in instrument cluster
V94 - Central locking motor with interior light switch-off delay unit
105 - connection to "ground" (body) - 1, in the electrical circuit of the central lock
A26 - connecting line (door contact switch / driver's side), in the electrical circuit to the dashboard
Q11 - positive connecting line (30 / az), in the electrical circuit power windows / central locking system and limit switch

Electric windows Audi 80

Electric windows

Wire colors: br - k, br / ge - k / w, bl - sn, sw / ro - b / kr, ge / bl - w / sn, ro / sw - kr / h, ro / bl - kr / sn , ge/br - w/c, br/ws - c/b, ro - kr, sw/bl- h/sn.

Q20 - connecting line - 1 (limit switch), in the electric window circuit
* - only if there is an auto-check system
C - three-phase alternator
D - ignition and starter switch
E40 - power window switch, front left
F2 - front left door limit switch with contact to buzzer
J139 - Power window control unit
S43 - thermal fuse for power windows (on the additional relay box)
T1x - 1-pin green plug connection, behind the instrument panel on the left
T2a - 2-pin plug connection, in the driver's door
T2c - White 2-pin connector, behind the dashboard on the left
T5a - 5-pin brown plug connection, plug-in station in auxiliary relay box
V14 - power window motor, left
32 - point of "mass", behind the dashboard on the left

A17 - connecting line (61), in the electrical circuit to the dashboard

Wire colors: br - k, sw - h, sw / gl - b / w, ge / sw - w / h, br / ro - k / kr, ge - w, gl / ge - w / w, sw / ws - b / w, ws - b, ro / bl - kr / sn.

A26 - connecting line (door limit switch / driver's side), in the electrical circuit to the dashboard

* - set to any free relay cell
E39 - Rear power window lock switch
E41 - front right power window switch
E52 - power window switch rear left (in the door)
E53 - rear left power window switch (on the center console)
E54 - power window switch rear right (in the door)
E55 - rear right window switch (on the center console)
E107 - power window switch (in the front passenger door)
V15 - Power window motor on the right
V26 - rear left power window motor
V27 - rear right power window motor
89 - connection to "ground" (housing) - 1, in the power window circuit
Q9 - connecting line in the electric window circuit
Q10 - positive connecting line (87), in the electrical circuit power windows / central locking and door limit switch

Audi 80 battery

Accumulator battery

The battery is the center of the Audi 80's on-board electrical system. Its energy reserve is used by various power consumers, and the battery is charged by a generator.

Principle of operation

The electrode (lead plate) is in contact with dilute sulfuric acid (electrolyte) and, under the action of the solution, gives off positive ions, that is, electrically charged particles, to the electrolyte. Thus, an electrical voltage is created between the electrolyte and the lead plate.

However, the voltage created as a result of the "voluntary" transition of charged particles is not enough, and the battery is supplied with a charging voltage. As a result, the lead sulfate of a discharged battery is converted to lead dioxide at the positive electrode and lead sponge at the negative electrode. At the same time, sulfuric acid is again formed in the electrolyte, an external sign of an almost completed charging process is the appearance of gas bubbles.

When discharging battery goes reverse process. The lead dioxide of the positive plate and the spongy lead of the negative are again converted to lead sulfate, with sulfuric acid consumed and water formed. Therefore, with the discharge of the battery, the density of the acid decreases.

Battery symbol

In Audi 80 models with 4- and 5-cylinder engines, the battery is located at the rear right in the engine compartment. Models with 6-cylinder engine: The battery is located on the left front in the engine compartment. At the installation sites, it is protected by a cover.
The following batteries are installed on the Audi 80:

• 12 V/40 Ah, type number 54045 (all 4-cylinder engines)
• 12 V/63 Ah, type number 56318 (5- and 6-cylinder engines)

Battery parameters

Voltage and capacity: In the designation 12V/40Ah, the first number (12V) of course indicates the voltage. Behind the slash is the current that the battery is able to give per unit of time - Ah means ampere-hours. This is the nominal capacity of the battery, measured under regulatory conditions. In practice, only 2/3 of the indicated ampere-hours should be counted; with an older battery, only half.

Cold cranking current: 220 A or 300 A indicates the amount of current that the battery can provide at a temperature of minus 18°C.

Type number: five-digit number serves everyone German manufacturers batteries to identify the battery. For Audi, the corresponding numbers are 54045 or 56318. The first number (5) means the battery voltage is 12 V. The numbers 40 or 63 that follow indicate the battery capacity. The last two numbers indicate design features such as model, polarity, venting hose and flare.

How many reserves are enough? Audi 80

How many reserves are enough?

How long a power consumer can function on the current from the battery can be calculated using the following formula:

Operating time = battery capacity multiplied by voltage onboard network and divided by the power of the consumer. In practice, however, you should never count on the full capacity of the battery, but only 1/2 to 2/3 of the rated capacity. This results in, for example, the following service life:

The effect of ambient temperature on the battery

Batteries tend to react to cooling more negatively the less they are charged. Completely discharged batteries are so sensitive that in cold weather they can even freeze and burst. If the battery, on the contrary, is fully charged, it tolerates the cold relatively well. Before the onset of the cold season, it is therefore recommended to check the degree of discharge on old batteries.

Electrolyte level control Audi 80

electrolyte level control

The battery fluid consists of sulfuric acid diluted with distilled water. Some of this water may evaporate or disintegrate during the charging process into hydrogen and oxygen.

The Audi 80 has a maintenance-free battery that complies with DIL 72311 and has a relatively large water reserve. Under normal conditions, it should do without adding new distilled water for the entire service life. Increased water consumption only causes fever ambient air, long stays in hot regions (holidays), faulty alternator voltage regulator, self-discharge when long parking vehicle or a deep discharge caused, for example, by the parking lights on all night.

1. The electrolyte in the battery must reach at least the lower mark on the case, applied with varnish or extruded, but at least well cover the upper edges of the plates.
2. If the fluid level is low, unscrew the plug.
3. If the battery is charged normally, then add distilled water to the upper mark or 15 mm above the upper edges of the plates.
4. If the battery is heavily discharged, then add only enough water to cover the plates on top, because when recharging, the liquid level will rise significantly.
5. Top up to the upper mark only after charging.
6. The amount of water from the filling bottle must be well dosed because the accumulator is easy to overfill.
7. An overfilled battery “boils”, acid protrudes from the cork.

Removing the battery

Removing the battery of the 6-cylinder engine is the same as for other versions:
1 - positive conclusion;
2 - negative conclusion;
3 – a bolt of a fixing plate. The exhaust hose in the illustration is covered by the edge of the wing.

1. Disable the anti-theft system and radio code so that they can be re-enabled after the battery is connected.
2. Models with 4- and 5-cylinder engines: remove the battery cover after loosening both fixing clips on the right and left, or quick locks.
3. Models with 6-cylinder engines: to remove the battery protection, unhook the plastic fasteners at the bottom, one towards the engine and one towards the fender.
4. Be sure to disconnect the negative cable first to prevent a short circuit during further work with the battery.
5. Loosen the nut on the negative wire terminal, disconnect the terminal from the negative terminal.
6. Loosen and remove the positive wire terminal.
7. Unscrew the bolts of the mounting plate at the bottom of the battery, remove the bolts and the bar.
8. Disconnect the plastic hose from the central gas outlet.
9. Take out the battery.
10. When installing, first connect the positive, then the negative wires.
11. It is almost impossible to mix up the wire terminals without applying force, because the positive terminal is thicker than the negative terminal.
12. Turn on the alarm and radio again.

Caring for battery contacts

1. Wash the crystals on the battery terminals with warm water and soda or treat with Leutralol from Varta.
2. Lubricate the leads and terminals of the wire with acid-proof grease("Ft 40v1" from Bosch).
3. On the sides of the terminals and inner sides the terminals must not be lubricated, otherwise there may be problems with the contacts.

Audi 80 battery charge check

Checking the battery charge

1. If the battery seems "powerless" despite correct level electrolyte, the degree of discharge should be checked. To do this, you need to find out the specific gravity of the battery acid. To control you need a hydrometer.
2. Unscrew the battery cap.
3. Take in enough electrolyte with a hydrometer so that the hydrometer (spindle) floats freely in it.
4. 1.28 kg / l - the battery is fully charged; 1.20 kg / l - half charged; 1.12 kg / l - discharged.

Charging the Audi 80 battery

Accumulator charging

Connecting a battery charger

• Connect the positive wire to the positive battery terminal, the negative wire to the negative terminal.
• While charging, the battery can remain in the vehicle.
• It is not necessary to remove the battery wires with a weak charger.
• The battery plug may remain installed. The gas generated during the charging process will be able to escape through the vents in the cork.
• The charging current should initially be approximately 10% of the battery capacity (eg 4 A for a 40 Ah battery) and automatically decrease during the charging process.
• The battery is fully charged if the acid density does not rise within two hours.
• When the battery is charged, distilled water partially disintegrates. Gas bubbles are formed from hydrogen and oxygen - highly explosive detonating gas.
• Therefore, it is necessary to ensure good ventilation of the room, especially if high current charging occurs.
• When charging the battery, do not smoke near or use open flames.
• The explosive gas can also be ignited by a spark when installing or disconnecting the charger or battery wires.

Starting the engine with a dead battery Audi 80

Starting the engine with a dead battery

The method of starting the vehicle by pushing or towing can be dangerous if the vehicle does not start due to a malfunction in the ignition system. In this case, the unburned mixture may ignite and raise the temperature in catalytic converter to dangerous levels. In the event that the engine does not start only due to a discharged battery, such things are not dangerous.

Starting the engine with another battery (“lighting”)

1. Drive the vehicle with the charged battery close enough to allow easy access to the wire to connect its battery to the battery.
2. Check if all power consumers are turned off in your de-energized car.
3. Connect the positive terminals of both batteries with the first wire.
4. Connect the other wire first to the negative terminal of a charged auxiliary battery, and then in the engine compartment of a de-energized vehicle to a bare body (for example, directly to the engine).
5. Start the support vehicle's engine and run it at a higher speed so that the alternator generates more voltage.
6. If the engine does not start immediately, take a break to cool the starter. Auxiliary engine leave to work further, due to which the discharged battery is slightly charged.
7. When disconnecting auxiliary wires, first disconnect the negative terminal of the charged auxiliary battery.

Push start engine

With two assistants, you can effortlessly push the Audi from its place.

1. Turn on the ignition.
2. Engage first gear, in higher gears the alternator rotates too slowly and will not provide a powerful current supply.
3. Squeeze the clutch, assistants should push the car.
4. If it starts to move, release the clutch.
5. As soon as the engine starts, immediately depress the clutch and add "gas".

Starting the engine by towing

For towing, it is better to choose an assistant who already has experience in this matter, otherwise an accident is possible. And remember: when the engine is not running, the power steering and brake booster do not work either.

1. Turn the ignition on, engage second gear and depress the clutch.
2. The vehicle in front should move slowly.
3. At a speed of approximately 15 km/h, slowly release the clutch while placing your right hand on the parking brake lever.
4. If the engine starts, depress the clutch and press the "gas".
5. Tighten the parking brake lever so that you do not hit the front car.
6. Give a sound signal to the driver of the front car.
7. Put the shift lever in neutral position, release the clutch.
8. Slow down gently parking brake along with the towing vehicle.

Audi 80 generator

Generator

Bosch generator (old version), rear view

1 – D+-connection (to the battery charge indicator);
2 – B+ connection (to the storage battery); 3 – voltage regulator;
4 - noise suppression capacitor.

Since the Audi 80 cannot drag an extension cable, electricity generation must take place directly in the vehicle. This task is performed by the generator. And not only for lighting, as it used to be, but for all electrical systems in Audi.

Three-phase alternator

Power

Until about December 1991, some versions of the Audi 80 were equipped with a 65 amp alternator, now only 90 amp alternators are installed. In special versions, 110-amp or 120-amp generators can also be installed. To calculate the power of the generator, you need to multiply the indicated maximum current by the nominal voltage of 14 V. It turns out, for example, 90 A x 14 V = 1260 W. You have already noticed: the alternator in the 12-volt on-board network actually gives 14 V. Because the battery can only receive current for charging thanks to this little difference in suspense.

The transmission from the crankshaft pulley to the generator pulley is chosen, by the way, in such a way that already on idling approximately 2/3 of the generator power was produced.

Generator Maintenance and Safety

The three-phase alternator has a sufficiently high power and generates current even at idle engine speed. Its sliding graphite contacts (brushes) withstand more than 80,000 km. According to its name, it produces alternating current, which is not used in a car, since the battery can only be charged with direct current. Therefore, rectifier diodes are built into the generator, turning the alternating current into a pulsating direct current. Since these diodes are sensitive to high voltage, you should be aware of the following:

• When the generator is running, do not loosen or connect the wires between the battery and the generator. This can cause a voltage spike (voltage peaks) that will damage the diode.
• A three-phase alternator should not operate without a properly connected, healthy battery, because the battery acts as a kind of surge buffer.
• All cable connections between the three-phase alternator, battery and body metal or power unit ("ground", body) must be tight. Even loose contact can lead to dangerous voltage peaks.
• When charging the battery quickly (do not use when charging with automatic cut-off chargers) and when doing electrical welding work on the body, both wires must be disconnected from the battery so that the alternator diodes are not damaged.

Audi 80 battery charging indicator

Battery charging indicator

• The indicator in the instrument cluster has two positive leads, namely one on the D+ side of the alternator (blue wire) and the other on the terminal 15 side via a blue multi-pin plug connection coming to the instrument at the rear of the ignition switch (black/blue wire).
• When the ignition is switched on, voltage is applied to terminal 15. The alternator, however, is not yet running, and therefore the unpowered D+ contact acts as a minus. The indicator flashes because there is a potential difference between the on-board network, which is powered by the battery, and the idle generator.
• If the engine is started and the generator has reached the required speed for charging, the voltage regulator connects it to the on-board network. Power is now supplied from terminal 15 and additionally from terminal D+. When there is no potential difference, the charge indicator goes out.
• When the ignition is turned on, the charge indicator should “pre-excite” the generator. Only in this case, the generator will be able to produce current already at low speeds. However, pre-excitation is only necessary when the generator is first started.

Charging doesn't always happen

Even if the charge indicator is off, this does not mean that the battery is actually being charged. This only says that there is no longer a potential difference between the battery and the generator. If on Idling engine is turned on, for example, all current consumers, then the charge indicator is off, although more current is supplied from the battery than a low-power generator can generate: nevertheless, there is no voltage difference with the battery.

Audi 80 voltage regulator

Voltage regulator

An alternator in a car can be compared to a dynamo on a bicycle: the faster the rotation, the higher the voltage and thus the generated current. Automotive power consumers would not be able to withstand such fluctuations for a long time, and therefore a special regulator must limit the voltage of the generator and prevent overcharging of the battery. This regulator, an electronic voltage regulator, is mounted directly on the generator.

Self-repair of the generator and regulator Audi 80

Independent repair of the generator and regulator

Usually the generator does not require repair, except for the replacement of the generator brushes. More severe damage cannot be repaired with home remedies.

Charging voltage test

1. Connect a voltmeter between the thick red wire terminal of the generator and ground.
2. Leave the engine running at medium speed.
3. If the voltage regulator is working, the voltmeter should show 13.3 to 14.6 V.
4. If not, check the brushes or replace the regulator.
5. Otherwise, the generator itself is faulty.

Checking the brushes

1. Disconnect the negative battery terminal.
2. Bosch alternators: remove the cover on the rear battery (where present).
3. Disconnect the regulator from the generator. To do this, remove two screws.
4. Swing out the regulator so that the carbon brushes do not stick in the holders.
5. Measure the protrusion of the brushes.
6. The length of the new brushes is 13 mm; minimum length 5 mm.
7. Valeo alternators: Unscrew both fixing screws of the regulator on the back of the alternator.
8. Pull out the regulator.
9. Measure the length of the protruding brushes.
10. If the remaining length is 5 mm, the brushes are worn out.
11. Valeo alternator brushes cannot be purchased separately; the entire regulator needs to be replaced.

Brush replacement

It is no longer possible to replace the brushes on the regulators of the new generation of Bosch generators - therefore, carbon brushes are no longer sold as spare parts. If they are worn out, the entire regulator should be replaced. The same can be said about the Valeo generator; carbon brushes are not sold as a spare part - you need to buy a new voltage regulator if the brushes of the old one are worn out.

However, for Bosch generators of the old generation, such a replacement is possible. This will require a soldering iron, solder and, in addition, knowledge of soldering.

1. Remove the voltage regulator as described above.
2. Unsolder stranded flexible wires, pull out carbon brushes.
3. Remove pressure springs from old brushes and put on new ones.
4. Solder stranded flexible wires.
5. At the same time, use a little tin and work quickly so that the wires do not suck in a lot of tin. Otherwise, they will become rigid.

if the brushes are removed, then you can simultaneously check the copper slip rings(brushes walk on them). If deep traces of running-in were found on them, then they need to be turned and polished in an auto-electric workshop.

Removing the generator

1. Models with 4-cylinder engines: remove the cover (where present) of the pivot bolt at the front on the toothed belt guard.
2. Models with 5-cylinder engines: remove the lower protection of the engine compartment.
3. Models with 4- and 5-cylinder engines: Disconnect the wires from the alternator.
4. Disconnect the cable to ground, where present.
5. Loosen the clamping bolt on the alternator adjusting bar.
6. Loosen and remove the V-belt or V-ribbed belt
7. Loosen and remove the pivot bolt while holding the alternator.
8. Models with 6-cylinder engines: remove the lower protection of the engine compartment.
9. Remove the V-belt (description of work later in this chapter).
10. Remove the connecting wire and the cooling air guide from below.
11. Loosen the mounting bolts, remove the generator.

Driving with a faulty alternator

if the alternator or voltage regulator is not working, then you can still continue the trip, since the battery can take over the role of the power source. During the day, its current supply is enough for a long time, because e-governance ignition/injection and the electric fuel pump require a minimum voltage. In addition, often the battery is only 2/3 charged. Depending on the capacity of the battery, you can still drive for at least 5 hours. In winter, the general weakness of the battery is a complicating circumstance. In addition, it is necessary to turn on the headlights earlier.

Therefore, saving current should be the motto: do not interrupt the trip unnecessarily, because the starter needs a particularly large amount of current. If possible, it should be started "from the coast." Do not turn on the heated rear window, heater and radio. Save money on glass cleaner. At night, drive without high beams and fog lights. In addition, disconnect the cables from the generator and insulate them separately so that the battery cannot be discharged through a faulty generator or voltage regulator.

Checking the condition of the V-belt or polyline belt Audi 80

Checking the condition of the V-belt or polyline belt

1. To check the belt, rotate the engine fully several times.
2. Only in this way can you really see all the surfaces of the belt. Often there is a single, but deep gap on the belt, which, when controlled, can be exactly on the pulley.

5-cylinder

hydraulic booster pump

5-cylinder

air conditioner compressor

If a new V-belt is installed, its tension should be checked after about 100 km and tightened if necessary; new belts stretch more at first.

V-ribbed belt tension

• The V-ribbed belt of a 4-cylinder engine of a model manufactured after September 91 will have to be re-tensioned during the control. So you need to loosen the belt and set the tension according to the scheme described in the next paragraph.
• The V-ribbed belt of the 6-cylinder engine always has the correct tension thanks to the automatic tensioner.

Tension V-belt or V-ribbed belt Audi 80

V-belt or poly-V-belt tension

V-belt tension 4-cylinder engine

Alternator V-Belt

1 - clamping bolt;
2 - adjusting nut with a gear rim; 3 - adjusting bar.

Power steering pump V-belt

1 - safety bolt;
2 - clamping bolt; 3 - adjusting nut with a gear rim.

Parts of the crankshaft pulley for models with a 4-cylinder engine and air conditioning

1 - pulley hub;
2 - extra adjusting washers;
3 - the front half of the pulley; 4 - adjusting washers;
5 - the rear half of the pulley.

Models with 4-cylinder engines

1. Alternator V-belt up to September 91: Loosen the clamping bolt on the alternator adjusting bar.
2. Turn the adjusting ring nut below until the correct belt tension is achieved.
3. Tighten clamping bolt.
4. If the alternator cannot be moved, then the pivot bolt must be loosened.
5. It becomes accessible from the front by removing the toothed belt guard.
6. If the pivot bolt has been loosened, it should be re-tightened as a last resort.
7. Alternator V-belt after October 91: loosen the clamping bolt on the alternator mounting bracket.
8. Loosen the hinge bolt at the bottom of the alternator, check for ease of movement.
9. Tighten to 6 Nm and hold the geared adjusting nut with a 22 mm ring wrench with a torque head. So the belt tension will be correct.
10. Tighten clamping bolt.
11. Lastly, tighten the pivot bolt again.
12. V-belt for water pump and power steering pump: Remove lower engine compartment guard.
13. Loosen the clamp bolt on the power steering pump mounting bracket.
14. Turn the adjusting ring nut below until the correct belt tension is achieved.
15. Tighten clamping bolt.
16. If the power steering pump cannot be moved, then its pivot bolt must be loosened.
17. A/C Compressor V-Belt: Belt tension is adjusted by removing or adding shims between the front and rear half of the pulley. More shims between pulley halves means less belt tension. Fewer shims between pulley halves results in more belt tension.
18. Excess shims should be placed between the hub and the front half of the pulley.
19. Tighten the nuts to a torque of 25 Nm, making sure that the V-belt does not jam between the pulley halves.
20. Turn the crankshaft twice.
21. Check the belt tension by firmly pressing your thumb on the free space between crankshaft and air conditioning compressor.
22. Start the engine and let it run for a bit.
23. Recheck the tension of the V-belt, add or remove shims if necessary.
24. At correct tension belt, tighten the bolts again to 25 Nm.

Models with 5-cylinder engines

V-belt tension 5-cylinder engine

Alternator V-Belt

1 - gear rack;
2 - adjusting nut with a gear rim; 3 - clamping bolt.

Power steering pump V-belt.

1 - adjusting bolt;
2 - fastening nut of the fastening rail; 3 - fastening nut of the rotary rail.

1. Alternator V-belt: loosen the clamping bolt on the mounting rail.
2. Turn the adjusting ring nut below until the belt tension is correct.
3. Tighten clamping bolt.
4. If the alternator cannot be rotated, slightly loosen the hinge bolt (generator lower mounting) with the lower engine compartment guard removed.
5. Power steering pump V-belt: Loosen the fastening nuts on the mounting rail and swivel rail.
6. To tension the belt, turn the tension bolt to the left, that is, turn it out.
7. Tighten the nuts again.
8. A/C compressor V-belt: Loosen the clamping bolts at the front and rear on the A/C compressor bracket.
9. Move the bracket for the air conditioning compressor together with the compressor to the right side of the vehicle. If necessary, use the lever from below.
10. If the belt tension is correct, tighten the clamp bolts again.

Models with 6-cylinder engines

V-ribbed belt tension on a model with a 6-cylinder engine. In the figure, the tensioner roller is fixed with a hexagonal punch, which makes it possible to turn it with a ring wrench. The photo shows a star bolt, which has a star head fitted with a suitable box spanner (2) for turning. The pin (1; this role is played by a punch in the illustration) is inserted into the hole provided for this purpose on the tensioner, due to which the tensioner is fixed in this position.

If the spring is broken, then the belt sags freely over the pulleys. In this case, the tensioner must be replaced.

Broken V-belt Audi 80

Broken V-belt

While the V-ribbed belt, in fact, should serve the entire life of the vehicle, the V-belt may well break.

If the belt is broken, one of three effects occurs:

• The red charge indicator flashes during the trip.
• Steering suddenly becomes heavy.
• The air conditioner doesn't work.
• The engine is overheating because the water pump is not working. This is the most dangerous effect, because it appears later than others.

Engine overheating due to damaged V-belt Audi 80

Engine overheating due to damaged V-belt

If the V-belt of the power steering pump breaks on models with a 4-cylinder engine, the drive to the water pump is interrupted at the same time and the engine overheats. Because of this, the sealing gasket of the cylinder head is irreversibly damaged, and in worst case even the entire cylinder head with correspondingly high repair bills.

• Therefore: if steering on models with a 4-cylinder engine, suddenly becomes heavy during a trip, you should immediately stop and check the serviceability of the V-belt over the pulleys of the water pump and power steering pump. If the fears are confirmed: call a tow truck!
• If the trouble happened to other V-belts, then it is not so tragic. In this case, you drive either without power steering (models with 5-cylinder engines only), or without a generator, or with the air conditioner not working to the nearest workshop.
• In models with a 5-cylinder engine, there is no danger of overheating, since the water pump is driven by a toothed belt.
• The same is true for models with a 6-cylinder engine.

Overview of V-ribbed and V-ribbed belts Audi 80

Overview of V-belts and V-ribbed belts

The following table shows the dimensions of the V-belts and V-ribbed belts for the different versions of the Audi 80:

air conditioned

The figure shows the passage of the V-ribbed belt for a model not equipped with air conditioning.

1. In no case should a new V-belt be “pulled” onto the pulleys with a screwdriver, because the resulting cuts, so to speak, predetermine the next break in the belt.
2. Loosen the old belt for replacement.
3. Now you can safely remove it from the pulleys, and the new belt can be conveniently put on them.
4. Please note that other V-belts will need to be removed if necessary, or you will need to disconnect the front engine mount.
5. Finally, tighten the belts, drive about a hundred kilometers and then tighten them up.
6. You will find out which V-belt where to put in the Audi 80 from the table above.

Replacing the poly V-belt on models with a 6-cylinder engine

1. Remove poly V-belt cover.
2. Install a 15 mm ring wrench on the hex of the tensioner and move it to the right (sometimes star-head bolts are installed).
3. Insert a pin (e.g. a suitable bolt, etc.) into the hole provided for this and thus secure the tensioner.
4. Mark the direction of rotation of the belt with chalk or felt-tip pen.
5. Remove poly V-belt.
6. When installing, place the V-ribbed belt first on the drive and guide rollers; lastly on the tension roller.
7. Raise the tensioner again with a wrench and remove the pin.
8. Install cover.

Starter Audi 80

The starter on the right side of the engine is hard to reach (illustration shows a 4-cylinder engine)

1 - starter;
2 – wire of the plug 50 (from the ignition lock); 3 - terminal 30 wire (from battery);
4 - starter mount.

The illustration shows the starter (5-cylinder engine) disassembled

1 - brush holder;
2 - anchor;
3 - reducer;
4 - retractor bearing housing; 5 - body
6 - bearing housing cover;
7 - bearing cap;
8 - lock washer, adjusting washer and sealing gasket.

Engine starting

1. When the ignition key is turned to the "Start" position, power is supplied to terminal 50 of the solenoid relay located on top of the starter.
2. In this case, the engagement lever engages the starter gear along spiral turns with the gear ring of the engine flywheel.
3. Only after the gear is fully engaged, the retractor switch turns on the battery power supplied from terminal 30, and then the starter spins the engine strongly.
4. The starter motor and gear are connected to each other through a gearbox. Therefore, the electric motor rotates much faster than the gear.
5. When the engine is started, the gear again disengages from the flywheel.

Removing the starter

1. Disconnect the ground wire from the battery, otherwise there is a high risk of a short circuit.
2. Remove the bottom protection of the engine compartment
3. Raise the vehicle at the front right and secure.
4. Remove all wires from the solenoid relay.
5. Remove the starter bracket from the front in the direction of travel (where present).
6. Unscrew the mounting bolts or nuts on the starter mounting flange (i.e. at the rear in the direction of travel).
7. Remove starter.

Brush replacement

If the starter does not work, then perhaps the whole thing is the wear of its brushes. Carbon brushes can only be purchased with a mounting plate. Since the starter housing needs to be sealed after opening, you will also need D 3 sealant in the parts store. Further, for models with a 4-cylinder engine, you will need a powerful soldering iron and solder.

1. Remove starter.
2. On the closed side of the starter, unscrew the two slotted head screws securing the small bearing cover, remove the cover.
3. Remove the lock washer and shim from the shaft under the cover.
4. Remove both screws (or nuts from the studs) from the rear housing cover and remove the cover.
5. Measure the length of the brushes - the minimum length is 8 mm.
6. To replace the brushes, disconnect the mounting plate from the retractor.
7. Reassemble the starter, while sealing the housing cover, mounting screws and bearing cover.

Removing the solenoid relay

1. Remove starter.
2. Disconnect wire from starter.
3. Unscrew the three screws on the mounting flange of the solenoid relay.
4. Slightly press the retractor relay and remove the lug from the starter lever.

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In the Audi 80 car in the back of B3 and B4, regardless of the configuration and specific model, there are 2 complementary fuse boxes. Designations are given after the introductory part of the article. They perform various functions, and on-board equipment is connected to them. So, in the block located in the engine compartment, there are power fuses and relays that ensure the operation of large current consumers: gasoline pump, headlights, wipers, air conditioning, cooling fan, ignition system, horn, etc. The block located in the cabin (it is often called additional ), is responsible for the operation of devices, without which the operation of the car is not comfortable.

If the electrical equipment of the car is in good condition, then the fuses burn extremely rarely - usually the cause of such a malfunction is a human factor.

Why fuses burn

A frequent contender for replacement is the cigarette lighter fuse. It is located in a block located in the engine compartment, and is additionally responsible for the operation of the audio system, on-board computer, interior and trunk lighting, and illumination of the mirror in the visor. Connecting a powerful tire compressor, inverter, or other equipment with high current consumption to the cigarette lighter often leads to a fuse failure. It is not recommended to replace it with elements with a different rating, as this may lead to a malfunction of the wiring. And its repair is much more expensive than the cost of the fuse.

Lamp installation high power may also cause the fuse to blow. Also, powerful lamps get very hot, which negatively affects the reflector and glass (especially if they are made of plastic). As a result of heating, the plastic glass of the block headlight begins to transmit light worse, which negatively affects the operation of the headlights. Constantly failing fuses can cause the complete loss of the head light, which makes the operation of the machine impossible. The maximum permitted power of the bulbs is indicated in the instruction manual and on the headlights of the car.

Independent, unskilled, intervention in the on-board electrical system of the car is also quite common cause failure of electrical equipment.

Exceeding the rated load on the fuses, poor-quality insulation - all this can easily cause them to burn out. It is not recommended to replace burned-out elements with wires, coins, or set a higher denomination - this can lead to a fire in the wiring.

Mounting block in the engine compartment

If the fuel pump stops working, the first thing to do is check its fuse. To do this, you need to open the hood of the Audi 80 b3 and look into the niche near the windshield on the driver's side. In this place there is an Audi 80 fuse box, a relay and a diagnostic connector for connecting the car to a computer.

Useful article: We adjust the handbrake of the Audi 80 B3 car on disks or drums

For Audi 80 to 91, the fuel pump fuse is number 13 in the top row, its rating is 15 amps. In total, there are 21 elements in the block (out of 22 for models with a diesel engine), and in the wiring diagram there are additional fuses used depending on the modification and configuration of the car.

Additionally, the following relays are located in the mounting block:

• fuel pump relay;
• relays for fog lights and rear dimensions (if not included in the configuration, then a jumper is installed in this place);
• starter relay;
• horn relay;
• turns relay;
• climate control relay;
• wiper relay;
• headlight washer relay, fan, security system, etc.

On the cover of the mounting block there is a diagram of elements, there is also a decoding in the manual for the Audi 80 b3 car.

For the Audi 80 b4 brand, the location of the mounting block is completely similar, with the exception of the total number of elements and their purpose. So, the fuel pump at b4 is connected to element No. 12, and the location of the relay also differs from model b3.

In the event of a malfunction with electrical equipment, you should first check the integrity of the fuses located in the engine compartment of the car. Even if the speedometer has stopped working, then with a good degree of probability the reason may be hiding in the fuses, it is much easier to notice their integrity than to disassemble the instrument panel and directly check its elements for a malfunction.

Experienced drivers use the fuse responsible for the operation of the fuel pump as follows: often in winter, unsuccessful attempts to start the engine lead to the fact that the candles are “filled” with gasoline, as a result of which the car cannot be started. To dry the spark plugs, just pull the pump fuse out of the block and turn the engine with the starter for a few seconds - the fuel supply will stop, and due to ventilation, they will dry out pretty quickly.

Additional fuse box

To gain access to the additional unit located in the passenger compartment, it is necessary to unscrew the four screws securing the cover located under the steering wheel.

The complete set of the additional block depends on the modification of the car, and often not all elements of the circuit may be involved.

In the additional unit, automatic fuses are installed that turn off in the event of a short circuit in the network - after the malfunction is eliminated, they will turn on on their own.

AT saloon block the following components of the electrical circuit of the car are located:

• common fuse;
• climate control or air conditioning control unit;
• automatic transmission control unit and ABS system;
• control unit for electric motors of windows and sunroof;
• electronic engine control unit;
• heating control for driver and passenger seats (separate blocks for each);
• power seat control;
• head light control system;
• interior lighting;
• belt and airbag control;
• warning system for oil pressure, closed doors, etc.

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Also in the wiring diagram there are unused elements (reserve), to which additional equipment can be connected: an amplifier for speaker system, burglar alarm, electric trunk lock and others additional devices and electrical equipment.

Trust the installation of new devices or the repair of electrical wiring in an Audi 80 car should only be trusted by professionals - otherwise there is a high risk of ignition of the wiring.

If the fuses in the car suddenly blown, the cause of the malfunction must first be eliminated, otherwise they will continue to burn.

Some videos will help you

Each electrical device in the car is designed for a certain voltage. The diameter of the supply wire is calculated taking this voltage into account. If the current consumption in a certain circuit, for example, due to the connection of additional consumers, increases, then the supply wire experiences additional load. It can overheat or even burn out if the current flow is not interrupted in a timely manner. This function is performed by fuses. To avoid a complete blackout of the on-board network, each circuit has its own fuse. However, the connections to the battery, alternator, starter and ignition switch are not fused.

To remove and replace fuses, use the plastic clip attached to the cover of the central distribution panel (see illustration 3.0).

If a new fuse blows immediately after installation, then make sure that the fuse of the correct rating was installed, and not less. If the rating matches, then check separately all consumers of this circuit. Use the appropriate wiring diagram for this. If necessary, disconnect all consumers of the circuit, and then connect one at a time. If the fuse blows when another consumer is connected, then this consumer is faulty.

Purpose of the fuses
Main fuses
№	Consumer	Ampere
1	Fog lights, rear fog lights	15
2	Alarm	15
3	Horn, seat heating	30
4	Electronic clock, trunk light, interior light, vanity mirror, reading light, cigarette lighter, on-board computer, automatic air conditioning, radio, self-diagnosis system	15
5	2nd radiator fan speed	30
6	Rear right marker and parking lights	5
7	Rear left marker and parking lights	5
8	Right high beam headlight, high beam warning light	10
9	Left high beam headlight	10
10	Right low beam headlight, right headlight adjustment motor	10
11	Left low beam headlight, left headlight adjustment motor	10
12	Instrument panel, reversing lights, control system, automatic transmission, differential lock, on-board computer, speed control, retarder relay interior lighting with, electronic thermal switch, relay for turning on the fan radiator airflow	15
13	Fuel pump	15
14	License plate light, instrument panel light, engine compartment light, glove box light, automatic air conditioning	5
15	Direction indicators, windshield wiper, washer pump, heated windshield washer jets, radiator fan relay, air conditioning	25
16	Heated rear window, heated mirrors	30
17	Cabin blower, automatic air conditioning	30
18	Electric mirrors, Rear window wiper (Avant)	5, 15
19	Central locking, lock switch cylinder heating, anti-theft system	10
20	Radiator fan, 1st speed, interior fan	30
21	Diagnostic connector	10
22	Not used (vehicles with petrol engines) Glow plugs (vehicles with diesel engines)	30

Power windows, power sunroof and seat adjustment are equipped with automatic fuses that turn on themselves after the cause of their shutdown is eliminated. They are mounted on the block of additional relays on the left under the instrument panel. The main radiator fan fuse is also located on the auxiliary relay box.

Additional fuses
23	Not used	-
24	Not used	-
25	Heating lambda probe. Not available for diesel vehicles	5
26	trailer connector	30
27	Ignition/fuel injection system	10
28	Ignition/fuel injection system. Not available for diesel vehicles	10
29	Stop signal	10
30	Speed ​​control (vehicles with automatic transmission) Not used for vehicles with diesel engines.	5
31	ABS, differential lock	15
32	Ignition/fuel injection system Vehicles with TD diesel engines - fuel cut-off valve	10

The information is intended for models Audi 80 B4 1991, 1992, 1993, 1994, 1995 of release.

Considered cars Audi 80 b4 1991, 1992, 1993, 1994, 1995 release.

Fuse box in the engine compartment.

Located in the rear left side of the engine compartment.

1. diagnostic connector
2. fuses 1-21. For vehicles with diesel engines, fuse 22.
3. additional fuses 23-32
4. four spare fuses
5. relay designation on the cover of the distribution panel
6. clip for removing and installing fuses

The layout of the fuses and relays in the block.

decoding.

№	Purpose	Ampere
	Fog lights, rear fog lights
	Alarm
	Horn, seat heating
	Electronic clock, trunk light, interior light, vanity mirror, reading light, cigarette lighter, on-board computer, automatic air conditioning, radio, self-diagnosis system
	2nd radiator fan speed
	Rear right marker and parking lights
	Rear left marker and parking lights
	Right high beam headlight, high beam warning light
	Left high beam headlight
	Right low beam headlight, right headlight adjustment motor
	Left low beam headlight, left headlight adjustment motor
	Instrument panel, reversing lights, control system, automatic transmission, differential lock, on-board computer, speed control, retarder relay interior lighting with, electronic thermal switch, relay for turning on the fan radiator airflow
	Fuel pump
	License plate light, instrument panel light, engine compartment light, glove box light, automatic air conditioning
	Direction indicators, windshield wiper, washer pump, heated windshield washer jets, radiator fan relay, air conditioning
	Heated rear window, heated mirrors
	Cabin blower, automatic air conditioning
	electric mirrors
	Rear window cleaner (Avant)
	Central locking, lock switch cylinder heating, anti-theft system
	Radiator fan, 1st speed, interior fan
	Diagnostic connector
	Not used (vehicles with petrol engines)
	Glow Plugs (Diesel Vehicles)

Additional fuses audi a 80 b4 bottom row.

	Not used
	Not used
	Heating lambda probe. Not available for diesel vehicles
	trailer connector
	Ignition/fuel injection system
	Ignition/fuel injection system. Not available for diesel vehicles
	Stop signal
	Speed ​​control (vehicles with automatic transmission) It is not used in vehicles with diesel engines.
	ABS, differential lock
	Ignition/fuel injection system On vehicles with TD diesel engines, the fuel cut-off valve

Relay.

1 - relay for fog lights and tail lights. For vehicles without fog lamps, there is a jumper in this place.

2 - radiator blower fan relay (for vehicles without air conditioning), radiator blower fan relay to turn on the 2nd stage of rotation

3 - relay for turning on fans

4 - headlight washer relay

5 - X-contact of the unloading relay

6 - relay of fans for blowing the cabin (air conditioner with manual control), A/C fan relay for 2nd stage speed (automatic A/C)

7 - horn relay

8 - anti-theft alarm system relay (cars with a manual transmission). Cars without such a system have a jumper. For vehicles with automatic transmission, this place is free.

9 - relay interval wiper

10 - fuel pump relay

11 - radiator fan relay for turning on the 1st stage of rotation

Attention! For vehicles with diesel engines, pos. 2 and 3 are unoccupied and relay 10 is the glow plug relay

Additional relay box in Audi showroom 80 b4.

To access the unit, unscrew 4 screws and remove the cover.