Is it possible to make a heated rear window. How to restore and repair a heated rear window if it does not work. Heated rear window does not turn on

Each car is equipped with a rear window defroster, which allows the driver to have a complete picture of what is happening behind his car in bad weather. But sometimes it happens that this device fails, from which driving safety is significantly reduced. How is the rear window heating repair carried out, how to do this procedure yourself? Find out below.

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Rear window defogger description

First of all, you need to figure out what the conductive heating of a car is, how the filaments of the incandescent film work and what malfunctions are characteristic of it.

Device

Heated windshield or rear glass does a good job not only with thawing ice in the winter season, but also with fogging in dry weather. Thanks to the filaments of the incandescent film, the glass can evenly get rid of the ice while the machine is warming up. When the airflow from the heater just starts to get warm, heating the windshield or rear will already make it completely transparent. A heater is the only effective anti-fogging method.

As for the windshield, it is heated by exposure to warm air. As for the rear, in this case, the heater is a certain number of filaments on the film, mounted on glue, which operate on voltage. These threads, which are characterized by high resistance, are installed on the heated glass. Incandescent filaments, mounted on the glue, conduct energy through them, which allows heat to be generated. Ultimately, when the rear window heating button is pressed, the threads begin to warm up and completely heat it up.

Working principle and functions

If your rear window or windshield heating does not work, then in order to correctly diagnose breakdowns, you need to understand the principle of operation. Below is a diagram of the operation and connection of the heater with your own hands to the vehicle's on-board network. As you can see, power comes from the positive terminal of the battery through the ignition switch, as well as fuses, eventually going to the device controller and the relay contact. As for the negative terminal, it is connected to the vehicle body, one of the heater terminals is also connected to the ground.

During activation of the heater, the current begins to flow to the relay coil. After the relay is triggered, the power contacts are closed, as well as the simultaneous connection of the two terminals marked with numbers 87 and 30. Voltage is supplied to the car's heater, passing through threads mounted on glue, connected in parallel. After that, the voltage again passes through the mass of the car and returns to the minus of the battery.

Possible malfunctions and their symptoms

If the rear window heating does not work, then motorists usually find out about this when it starts to sweat or plaque forms on it. Turning on the heater function, you can wait for a very long time, as a result, there will be no results or the glass will be partially heated. You don't need to be a great specialist here to understand that the device needs repair.

Depending on the wiring diagram, the heater for the windshield or rear window of the car can be turned on with or without the ignition, but usually it still works when it is on. Depending on the vehicle, the windscreen or threads attached to the adhesive on the rear window may only fire after the engine is started. This allows you to prevent an accelerated discharge of the battery (video author - Bort Magazine Renault Megan).

It should also be noted that the device can operate on a current of 10 to 25 amperes, it all depends on the specific car.

So, if the rear window heating does not work, then there may be several types of malfunctions:

The system does not turn on. In the event that the lamp located on the button does not light up when the system is turned on, most likely the problem lies either in the button or in the fuse. If the lamp is on, but the threads set on the glue do not heat up, you need to check the relay. In some cases, the problem lies in the connectors connecting the device to the car's electrical circuit, so you need to check these elements too. Diagnostics is carried out in accordance with the service documentation for the car.
If the rear or windshield fogs up slowly, especially during the winter cold, the problem may lie in the poor contact of one of the connectors, this must be checked. As a result, the contact resistance will increase, and the voltage will be less powerful, respectively, the threads set on the glue will warm up longer. In order to check this, it is necessary to use a multimeter and measure the voltage indicator at the terminals of the device. If there are differences in the readings obtained, then they should be no more than one volt. Otherwise, it will be necessary to restore the heating of the rear window of the car.
Horizontal traces of fogging remain on the auto glass - another type of malfunction. One of the most common problems in this case is the breakage of the filament in certain places. Usually, you can check and identify such a breakdown without special devices, just by eye, since at the point of the breakage the auto glass will not be thawed or fogged up. It should be noted that even with a slight mechanical effect, the tracks are destroyed, therefore, when cleaning the auto glass, you must carefully use a scraper. If you practice transporting bulky goods, make sure that they do not rest against the rear window.

Diagnostics and repair

Ways to find a problem thread

It is not so difficult to make repairs and diagnostics with your own hands.

There are several options for checking with your own hands:

First of all, this is a visual check. If the auto glass fogs up, turn on the system. In the place where the break occurred, it will sweat almost immediately. In this case, the rest of the surface will not heat up. This DIY diagnostic method is the simplest.
Another option for checking with your own hands is using a voltmeter. You need to activate the ignition of the car and, accordingly, the heating system with your own hands. One probe of the voltmeter must be placed on the mass of the vehicle, and the second is wrapped in food foil, after which it must be brought to the heating thread. When performing this procedure with your own hands, you will notice that the voltage level is no more than 5 volts. If this indicator drops to 0 or rises to 12, a break occurred in this place.
Another option for diagnostics with your own hands is with the same voltmeter. One voltmeter probe is connected to the positive side of the system, and the second must be moved along the filament, from the negative side. Where the break occurs, the voltage level will drop to zero, in which case repairs will be required.
The last option for diagnostics with your own hands is using an ohmmeter. The probes of the device are connected to the minus and plus of the system. You need to take a piece of cotton wool and moisten it in distilled water, then run along the thread. When the ohmmeter needle starts to move, it will indicate an open circuit.

DIY repair options

How to repair a heated rear window at home? There are several ways:

Using a repair kit. In practice, repair kits usually have the same characteristics - they usually restore up to 10 cm of damaged thread. Such repair kits include the threads themselves, as well as a can or tube with a special polymer resin. For repairs, you need to accurately identify the breakage point, then turn off the heating system. Next, you need to remove the protective film and attach a new thread to the place of damage. Apply polymer resin with a brush, repeat the application procedure after complete drying. Wait a day before using the system again.
For repairs, you can use a conductive paste - a layer of the substance must be applied to the breakage site. It should be noted that when applying, it is necessary to grab a few centimeters on each side, wait about a day after application. To dry the paste faster, you can blow it over with a construction hairdryer.

Video "How to repair a heater at home"

A detailed procedure for repairing the system with your own hands is shown in the video below (the author of the video is SAMODELKIN and GADGET +).

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Many drivers are interested in what to do if the heating located on the rear window does not work? This is not just a whim, but a vital necessity, allowing you to always see what is happening from behind.

If, when looking in the rear-view mirror, the driver sees nothing but fog, then the risk of an accident increases many times over. That is why, as soon as you notice that the heating of the rear window electric filaments does not work, you must immediately start fixing it.

This is not a particularly difficult procedure, but in order for everything to go as it should, it is necessary to approach it as responsibly as possible. It is very important to follow the instructions exactly.

Features of the heating system for the rear window

Heating design

Before proceeding to the repair of the heating of the rear window elements, which you will do with your own hands, you need to understand the design of this device. In reality, it does not represent anything complicated.

There are two conductive tires on the sides of the rear window of the vehicle. Heating lines are located between them. Usually a high-resistance material is used to create them. The fact is that for effective operation, each thread must have a resistance in the region of 10 ohms. This is the only way to protect the glass from fogging.

The number of threads in the rear window heating is different for each car. In most cases, it depends on the length of the surface. During repairs, this exclusively affects the difficulty of detecting a break.

Important! All heating lines are connected in parallel. As a result, the breakage of one of them does not affect the work of the rest in any way.

Connection to the on-board network

To repair the heating of the rear window threads, you will need to study the connection diagram of this device to the automotive electrical network. The main role here is played by the ignition lock. It is through it that the voltage is supplied to the heating system.

Attention! For stable operation of the device, one terminal is shorted to the mass of the machine.

As soon as you turn on the heater, the current flows to the relay. After that, the contacts are closed, and the leads are connected. As a result, electricity is supplied to the heater without obstacles.

As soon as the current enters the electrical circuit of the glass heater, it begins to feed the filaments, which are connected in parallel to the general system. But that's not all. The fact is that the negative contact of the battery is also connected to the mass of the car. Thanks to this, a constant exchange of current is carried out.

As you already understood from the above material, the heating of each thread of the rear seat works thanks to the ignition key. As soon as it is in the ON position, the entire system is activated.

Attention! On some vehicles, the rear window defroster is only activated when the engine is running.

Many drivers are outraged by such a decision of the designers, but in reality it has its own logic. The fact is that the rear window heater consumes a lot of electricity. Usually this figure ranges from 10 to 25 A.

So that you better understand how much 25 A is - let's make a visual comparison. In order for one car headlight to shine, at least 5 A. one heater equals 5 headlights.

What can be malfunctions other than broken threads

To fix something, you first need to diagnose the breakdown. For a number of signs, you can first find out what exactly is the reason for the failure of heating the threads. So an inoperative rear window defogger indicator, when the button is pressed, indicates a faulty fuse.

An illuminated indicator and non-heating heating filaments located on the rear window indicate a malfunction in the relay. In turn, poor contact in the electrical circuit leads to too slow fogging of the glass.

We carry out heating repairs

Finding the place of the cliff

It is with this that you need to start the procedure for restoring the normal operation of heating all the threads of the rear window. First, look at all the lines visually. If nothing is visible, you can use the search techniques that have been developed by other drivers who are facing the same problem:

If at first glance, when examining the rear window, you did not find a break in the heating lines, you should not immediately proceed to more complex methods. To get started, just turn off the heating. In a place where the glass is not heated, a characteristic strip will appear.
Take a voltmeter, activate the heated rear seats. Place one probe on the weight of the machine, wrap the other with foil. At the same time, slowly move along each line until you reach the middle. The standard voltage is 5 V. If it drops below, then you have found the break. A jump to 12V also means a break.
There is another option for using a voltmeter. To do this, connect the plus to the terminal to the corresponding heating contact. The second probe must be moved slowly along the line. Moreover, this must be done on the side where the negative terminal is located. A drop in voltage means that you have found an open circuit.
Ohmmeter. An ordinary pointer device will work best. When you turn on the device, you must select the mega mode. Connect the probes to the heating leads on the rear window. Ordinary cotton wool soaked in distilled water is suitable as a connecting element. Follow the line. The reaction of the arrow will mean that you have found the place of the cliff.

As soon as the breakage point in the heating threads of the glass behind is found, you can proceed to a full-fledged repair.

We repair heating

There are many techniques for repairing threads that are responsible for heating the glass of a car in the back. TO for example, you can take the usual repair kit for the corresponding part. The advantage of this option is that you do not have to look for additional parts and tools. Everything will be in one package.

Attention! Before you start soldering, strip and degrease the heating system wires.

Some of the best kits for re-heating damaged rear window heat lines are made by Permatex and Quick Grid. They all have similar components.

The repair kit allows you to restore about 10 centimeters of the damaged thread. Usually the set already has ready-made lines. All you need to do is install them correctly.

The algorithm itself for repairing the heat lines of the rear window using a repair kit is very simple. You need to replace the damaged thread and apply the compound where the damage was.

Important! The procedure must be repeated two to three times for it to have an effect.

At the end of the work, remove the template. The heating must not be turned on for at least a day after you have done everything. Otherwise, all the work will be useless and you will have to redo it again.

The second method of repairing the heating of the rear window heat lines with your own hands is to use a conductive paste. Just apply it to the area where the threads were broken. Wait 24 hours. After that, all functions of the heating lines will be restored.

Advice! If you are pressed for time and need to go somewhere urgently, use a regular hairdryer to speed up the process.

Folk repair methods

Of course, the use of a repair kit and thermal paste has its advantages. They are easy to operate, and the result of repairs with these heating filaments made from a special material for the rear window is always high. However, you still need to buy them. And this takes money and time. In some cases, both with the first and with the second, some difficulties are possible.

It is not surprising that domestic and foreign motorists have come up with a whole set of various methods that can help in the shortest possible time with the help of the means at hand to restore the broken lines.

In order to bring to life the first popular method of repairing the heating of the rear window threads, you will need paint and shavings. To mine shavings need a copper-brass bar and a file. The color of the paint doesn't really matter. However, it is preferable to match the threads.

The shavings and paint are mixed one to one. As a result, you should get some kind of dough from these two elements. In order to make a stencil, ordinary scotch tape will work.

After the stencil is applied to the surface, turn on the heating filaments with a resistance of 10 ohms for the rear window. Only then apply the repairing mixture. As soon as the dough hits the damaged area, a specific hissing sound will be heard.

The main plus of the paint and shavings technique when repairing a heated rear window is that you don't have to wait. As soon as you hear an easily recognizable hiss, you can immediately enter the track without fear of fogging up the rear window.

The second popular method of repairing a heating installed on the rear window has some differences from the first. The mixture also uses shavings, but the paint is replaced with glue. BF-2 is ideal. Its restorative qualities will be more than enough to restore damaged threads.

Important! To provide a more reliable contact, you can use thin wires.

The third popular method of repairing the heating filaments attached to the rear window is conventional soldering. To do this, you need a flux and zinc chloride. Of course, you can't do without solder either. The vein that you will use during your work must be silver plated. Alternatively, copper can be used.

As you can see, folk methods allow you to restore even the most serious breaks in the heating lines on the rear window of a car with minimal costs. Unfortunately, unlike ready-made pasta, you have to make the composition yourself. And this takes time and effort.

Outcomes

The heating of the high-resistance threads of the rear window can be repaired by hand. You don't even need to buy a repair kit or paste for this. Enough tools at hand in the form of a bar and paint.

Even 25 years ago, the rear window heater was considered almost a space technology, and its appearance on the fives and sevens in export performance aroused frantic delight among the wild owners of Soviet cars. Today, only a lazy manufacturer does not put heating threads on the rear window, and this is no longer an option, but a standard equipment for all cars.

How the rear window defroster works

Heating filaments are located on the rear window of the car, on some models there is local heating of the windshield and rear side windows. The task of the device is to create a positive temperature on the glass surface, no matter what the temperature is overboard. This will get rid of fogging, icing and provide decent visibility in all conditions.

As standard, the heated rear window consists of several elements. The composition depends on the model, but, for example, on Renault Logan, the components are as follows:

conductive filaments
control lamp on the instrument panel
fuse in common block
power button
contacts
heater relay

The principle of operation is simple - the terminal from the conductive threads on the one hand is connected to the on-board electrical system, on the other hand it is tied to ground. When current is applied to the filaments, they generate heat, heating the entire glass area.

Rear window heater repair video tutorial

Typical heater breakdowns

Malfunctions in the system are visible immediately after starting the engine - if the glass heats up unevenly, as evidenced by uneven release from fogging or ice, then you need to look for a problem. Most often, a non-working thread causes incomplete warming up, but if the whole system refuses to work, then you need to look for the reason:

in violation of the contacts connecting the block of threads to the electrical system of the car
control relay failure
in the fuse in the electrical system

A defective fuse is the easiest to identify - you can ring it with a tester, or you can put it in a working condition. If the heater does not start now, consider the option with a relay. No one will disassemble and tinker with the relay, it's easier to immediately try to connect the working one. In the event of a fiasco, we are preparing to restore the threads or replace the rear-view glass completely.

DIY heater repair

It is impractical to change all glass because of one burnt-out thread. In Renault services, they do not repair threads, but offer a complete replacement of glass, so this action cannot be called rational. The procedure for restoring a heater is not difficult, does not take much time, with the right approach, it will save a lot of money.

Finding the problem thread and breakage

Finding out which of the threads does not work is as easy as shelling pears - it simply will not warm up the glass in its zone, and you will have to tinker with determining the location of the break.

Each of the threads is connected to the lateral vertical buses in parallel, therefore, it can work independently of the adjacent threads. If you managed to find the break point visually, with the help of a magnifying glass - great. If not, then a voltmeter will come in handy.

On the positive bus, the voltage should be 12 V, therefore, at the point of the break, the passage of current through the thread stops, and the voltmeter will show this with an accuracy of a millimeter. To do this, you need to fasten one voltmeter probe to the positive terminal, and with the heater turned on, draw the second probe along the non-working thread to the point where the voltmeter shows no voltage. The cliff is localized. In the same way, you can find out the breakage point with an automotive probe or ohmmeter.

Troubleshooting methods

Do-it-yourself rear window heating repair can be done in several ways to restore the filament. The choice of method depends on the width of the break and the material of the high-resistance thread, but the following are the best options:

Conductive pastes and adhesives. It is a simple, inexpensive and effective method. It can be safely used if the width of the break is not more than 1 mm. There are several special suture restoration kits on the market. Their price ranges from $ 12, they are sold in every car dealership. The kit already includes a paste, a syringe and additional strippers.
The method of using conductive glue such as "Contactol" or "Elekont" will be even cheaper. In this case, it is enough to simply apply glue to the damaged area with an overlap of the problem area by 5-10 mm. If the glue is not fake, then such a connection can work for a very long time and not cause problems.
Method of galvanic copper shrinkage. The method is very good, but with a whole chemical laboratory. With your own hands in a garage, its use can only be considered as a bold experiment.
Soft solder. Affordable and reliable method for recovering filaments. The threads are soldered using the conventional soldering method. But there is one important nuance - in no case try to clean up the seam with sandpaper. This will only increase the gap width. It is enough to simply degrease the thread with acetone.

Conductive pastes and adhesives - an inexpensive way to repair heating

If the gap width is more than a millimeter, then it is worth reinforcing the thread with a tinned copper vein 0.2 mm thick. For repairs, a POS-61 soft solder is used. In this case, the heating thread itself does not need to be tinned.

Thus, in almost 10 minutes you will solve the problem of heating the rear window and save on expensive replacement of the heater.

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At any time of the year, the driver needs a properly working car. And sometimes some details are considered not so important, and according to the law of meanness, they will be needed in difficult times. One of the troubles that can happen to a driver on the road is damage to the heated rear window. Both in winter during cold weather and in summer in rainy weather, this function of the car must be performed in full. Otherwise, moisture gets into the passenger compartment, and the visibility is reduced to the limit, as a result, the driver is forced to repair the rear window heater of the car.

Heating system and functions

The heater is powered by electricity. It is known that the windshield is affected by warm air currents, for the rear one needs special heating elements. It's no secret that the inner side of the rear window is equipped with metal tracks that have high resistance to electric current. When the current flows through the ribbons, heat is released and, accordingly, heating. The result is obvious: transparent, dry, heated glass.

The main function of this structural element is to combat icing, moisture and fogging. As soon as the system starts working, after a short period of time the glass is clean and transparent. In addition, this function allows you not to dry out the air in the car.

Damage to the heating system

As a rule, the driver notices damage in this part of the car only when the rear window is constantly sweating and does not get rid of the ice. After turning on the heater, ideally after a couple of minutes, it should be transparent and clean, but if this does not happen, then damage has occurred or the functioning is defective. Among the damage to the system, one should highlight:

Slow fogging of glass. If the visibility does not improve after a few minutes of heating operation, then the function is impaired. The reason may lie in the loose contact of the circuit connector.
Lack of operability of the heater when it is turned on. In this case, after pressing, the indicator does not light up. This may be due to a faulty key or a blown fuse.
The presence of horizontal stripes of fogging on the glass. As a rule, such a malfunction can occur due to the breakage of the heating filaments that are applied to the glass surface.

Slow fogging of glass

Whatever happens, the main thing is to make the correct repair of the rear window heating with your own hands or with the help of a specialist.

Fault identification and repair

It is believed that it is quite easy to identify damage to the heating system, and every driver will cope with the task. Before starting work, it is recommended to count the threads applied to the glass, so that later it is easier to remember which one is damaged. There are times when the gap cannot be seen: it is so small that one of the devices should be used. This can be a voltmeter or multimeter. In any case, in order to repair the rear window heating filaments, you need to carefully examine the surface and identify damage.

There are several effective ways to troubleshoot:

Method of visual diagnostics - in damaged areas when the heating is on, the glass does not warm up and remains fogged up.
Using a voltmeter - when the heater is on, put one probe on the "ground" of the machine, and the second, wrapped in foil, place it in the center of the thread. It is necessary to monitor the voltage, its indicator should not exceed 5 V. If the device shows 0 or 12 V, then there is a gap in this place.
With the use of an ohmmeter - the device turns on in the "kilo-ohm" mode and is connected to the opposite terminals of the heater. You should moisten a cotton swab and run along the thread. The place where the arrow will twitch and there is a gap.

Determination of malfunction of heated rear window

You can repair the heater using a variety of methods, for example, purchase a special kit for repairing the rear window heating threads.

The system can be repaired using a repair kit, conductive paste and folk methods. The main difference between all options is the materials that are used during work.

Repair materials

By purchasing a repair kit, the driver has the opportunity to repair the heating thread up to 10 cm. Materials used in such kits:

pattern with threads;
thermally active polymer resin in a balloon.

Materials for the repair of heated rear window

Work is carried out strictly with the heating system turned off. Having determined the place of damage, it is necessary to remove the protective film from the template and attach it to the found place. The application of the polymer material is done with a brush, and after drying is repeated several times. After completing the work, the stencil is removed and it is advisable not to turn on the heater for 24 hours.

In the case of using a conductive paste, you may only need a building hair dryer, which accelerates the drying of the material.

The materials used in the "folk" methods of repairing the heater are paint (glue) and shavings, metal for soldering the damaged area. As a rule, the paint is selected in accordance with the color of the threads and combined with the shavings, adhering to a 1: 1 ratio. For work, you will need a stencil on which the mixture is applied (with the device turned on). The advantage of this repair method is that there is no need to wait for 24 hours to dry. The driver can drive immediately after completing the work. Zinc chloride is suitable for soldering.

How to restore heat with glue

It is quite common for drivers to use conductive adhesive to repair heated rear windows. The material is mixed with shavings, which are extracted with a file or a copper-brass bar. The ratio is 1: 1. The result is a soft dough consistency. With the help of electrical tape or tape, a stencil is made, and the prepared mixture is applied to the site of damage. After the procedure, you do not need to wait for the materials to dry and you can immediately move on.

Rear window defogger repair adhesive

What to do with contacts, and other methods

If the contacts were damaged in the heating system of this element of the car, then it is best to use the soldering method. This method is the most reliable and will help you forget about this problem for a long time. Zinc chloride is perfect for work. It is recommended to use solder with a minimum tin content. After finishing the work, the glass must be thoroughly rinsed with water to remove the chemical residues.

Heat recovery price

In fact, repairing a heater is quite simple and inexpensive. Using the "paint + shavings" method, the driver will incur minimal costs by purchasing paint of the desired color (or using the available material) and preparing sawdust. If you buy a repair kit, it will be much more expensive. The cost also depends on the manufacturer of the conductive adhesive. It can be the well-known and expensive company Keller, or the cheaper manufacturer Loctite. An alternative option would be the glue of a Russian company.

When creating a passenger car, designers pay great attention to the glazing of the car. Glass plays an important role in the construction of a vehicle. They protect the driver and passengers from wind, dust and dirt. They serve as a soundproof barrier that allows people in the cabin to talk without stress.

Visibility from the passenger compartment and the driver's ability to properly control the traffic situation depend on their shape. For this, various modifications are made to the windows, including heated rear window.

The system that helps clear the rear window of ice, snow or fogging is not very complex structurally. The electrical diagram can be broadly depicted as follows:

C - generator.
E230 - OZS system switch.
J519 is the control unit for the onboard electrical supply.
Z1 - heating element of the OZS system.

Although there may be some differences on different car models, nevertheless, if we consider it in detail, then, in principle, it includes the following main elements.

Mounting block.
Ignition switch.
ZS heating switch.
Control lamp signaling the inclusion of the OZS.
Heating element of the OZS system.

K6 - additional relay.
K7 - relay for switching on the OZS.
A - connection to power systems.

In addition, the system contains fuses, terminals and wires that connect all the elements into a single whole.

When the ignition key is turned, the OZS is turned on by pressing a button, to which power is supplied through an additional K6 relay. At the same time, the relay for heating the rear window K7 is activated, the heating element is connected and at the same time the control lamp comes on.

The design of the heating element on the rear window can also be different. In the standard version, it is a mesh of thin metallic nickel threads, which are connected by two conductive busbars located on opposite sides. On the one hand, a current with a voltage of 12V is supplied to the bus, on the other, the bus is shorted to ground. Such devices are attached to the glass with a special glue.

On some car models, the heating element is applied to the glass using a coating, for example, aluminum. On top of such spraying, a thin film with good light transmission is attached using a conductive glue.

Identification of malfunctions in the OZS system

Having found signs that the rear window heating is not working, you need to carefully check the entire electrical circuit of the vehicle's NEO system.

The first thing to check is that the fuses are working properly. So, for example, on the VAZ-2110 these are rear window heating fuses F4 and F7, which are located in the mounting block. Their malfunction may occur due to a factory defect, a short circuit or a voltage surge in the on-board network. A defective fuse needs to be replaced, for which it must be removed from the mounting block.

Next, you need to check the terminal connections in the OZS system. During vehicle operation, all equipment is subject to strong vibrations. As a result, the contacts may be damaged, or a terminal may become disconnected or weakened.

A check of the heated rear window relay is also required. Breakdown of the relay is possible if a wire breaks in the working coil of this part or due to burning of the contacts, due to a factory defect or short circuit. To check it, the relay must be removed and checked with a tester. In the event of a malfunction of this part, you need to replace it with a workable part.

It is also necessary to check the contact of the heated rear window. A conductive element is attached to the rear window using glue, which is a contact to which an electric current is supplied through the wiring, which is transmitted through this contact to the heating threads.

In this place, a break in the wiring is possible, or due to the fact that the glue was of poor quality, the contact element peels off from the glass.

Quite often, breakage or damage to the threads in the heating element on the rear window leads to failure of the heating system. This is detected by visual inspection or instrumental analysis. Visually, only a clear damage to the thread can be detected by establishing a gap between the damaged ends.

It is possible that during some repair work on the car, mechanical damage was caused to the glass surface, on which a heating element is attached with glue.

However, the main tool in diagnosing this malfunction is a voltmeter or ohmmeter.

They make it possible to identify with high accuracy a section with faulty threads, even if this break cannot be visually detected.

Repair procedure for a faulty OZS system

Having determined the reason why the rear window heating does not work, you can start repairing this system.

If the fuses or relays of the NEO system are faulty, then the faulty parts must be removed. Replacing them with new, efficient ones does not amount to labor. The main thing is that they are installed as indicated by the diagram of the electrical on-board system.
In the case when the culprit for damage in the OZS system is the terminal connection, the restoration of the heated rear window is also straightforward. It is enough to clean the contacts in the terminals. It may be necessary to replace the terminal box, but this also does not take much time.
If the glue that attached the contact on the rear window turned out to be of poor quality and delamination occurred, then in this case you need to buy a new high-quality conductive glue. Remove the layer of old glue from the detached contact using a napkin with an alcohol solution. Then apply a coat of new bonding agent and glue the contact in place.

If a wire break is detected on one of the buses, this wire must be soldered to the old place using the connection diagram. The procedure is as follows:

remove the remnants of the old solder from the wire by stripping the end, in addition to this, the junction on the bus must also be cleaned;
using a brush, apply rosin paste as a flux to the cleaned surfaces of the bus and wires;
apply a solder containing three percent silver to the cleaned and roasted wire core;
solder the wire to the bus, while avoiding overheating of the surfaces.

Most of all, when repairing a rear window heating with your own hands, it is required if a break is found in the conductive threads of the OZS heating element. To facilitate this work, special repair kits for this system are available commercially. To fix the damage, the actions are performed in the following order:

in the area of the gap, clear an area six millimeters long in each direction from the place of damage;
wipe the cleaned area with a napkin or a cloth soaked in alcohol or alcohol solution;
on both sides of the damaged thread, stick thin strips of repair adhesive tape or ordinary construction tape, if there is no repair kit. Do not allow sticking of adhesive tape on nearby threads, in order to avoid damage to them;

if there is a repair kit, then mix the hardener with a silver-colored composition, which, after application, will act as a conductive thread. After mixing, apply this compound with a stick or brush to the damaged area, closing the chain.

if there is no repair kit, then the role of a special mixture will be played by glue, which conducts electric current well, it can be applied with a brush, observing accuracy;
after repairing the damage, it is necessary to give time for the glue or a special mixture to harden; a hairdryer can be used to speed up this process;

after the strip that conducts the current has dried, it is necessary to carefully remove the self-adhesive tape, for this it is best to cut it with a knife at the point where it adjoins the thread to be repaired so as not to damage it when removing the tape;

after the work performed, it is necessary to check the operability of the OZS, for which start the car engine and press the OZS activation button.