Often, motorists are faced with a problem when the alarm blocks the engine from starting. This is mainly due to new vehicles, where modern anti-theft devices are present.
Description of the principle of operation
So, the alarm blocks the engine from starting, what to do in such a situation, and where is the cause of the malfunction? Basically, this happens when an immobilizer or a two-way signaling is installed on the car.
First of all, this type of malfunction can be associated with a glitch in the alarm itself, that is, the anti-theft system did not see the key the first time. Also, the problem may lie much deeper than it repents at first glance. It should be understood that many modern machines native "signals" are installed, which are directly related to electronic unit engine control. But, let's not rush and consider everything in order.
Main malfunctions
The malfunction of the power unit should be discarded immediately, since the problem is definitely hidden in the operation of the anti-theft security system. So, there are several options that can help solve the current problem with engine blocking. Consider the main options for diagnosing and solving trouble:
- Key fob glitch.
- Immobilizer malfunction.
- Problems with the electronic control unit.
Solution Methods
Blocking the engine, if the alarm does not start the engine, you can remove it yourself, or, in more severe cases, you will have to turn to auto electricians. So, in order to diagnose, you will need some constructive knowledge in automotive electrics, as well as a set of tools.
key fob glitch
If the motorist got into the car and when turning the key it was not possible to start the engine, then the problem may be in the key fob. To start the engine, you must remove the key from the ignition, and then turn on central locking. Next, the central lock is turned off, and we try to start the engine.
If the described actions did not help, then you should turn off the ignition, and then exit with vehicle. We put the car on the alarm. After 10 seconds, we unlock the vehicle, get into the passenger compartment, and try to start the engine.
If all the described actions did not help, then you should look at the key fob and read the instructions for it. Perhaps the engine block was accidentally installed on it.
It should be understood that on different security systems, the indicator will be different, and therefore it makes no sense to describe a specific one.
Malfunction of the immobilizer or other factory system
Can block engines as standard installed immobilizer. A malfunction of the elements of the system can lead to the fact that the motor has stopped starting. In this case, it is recommended to contact an automotive electrician, as they will quickly find and eliminate the cause.
In the case of vehicles manufactured in the USA and Japan, a new type of anti-theft system is installed on them, which, without a key fob, will not start the engine. But even these security systems, are often at risk of failure and glitches, since they are controlled by the engine's electronic control unit.
In this case, a direct road to a car service, since only professionals are able to deal with the alarm, remove it and force power unit run.
ECU problems
Many motors and alarms are tied together on an electronic control unit. So, unexpected breakdown, or a problem with the motor sensor may cause an effect that could affect the starting of the vehicle's heart. In this case, it is worth complex diagnostics, eliminate errors and try to start the motor.
Independent actions with a complex electronic control unit can lead to full exit it is out of order, and accordingly to the replacement of the node.
Conclusion
You can find and eliminate the cause of the engine blocking by the alarm, but it is recommended to contact a car service. Do not panic ahead of time, because often the reason lies in the elementary glitch of the key fob, and repeated blocking and removal from central lock solves all problems.
website - intelligent monitoring!
A lot of spears have been broken around this topic! Some manufacturers even developed special firmware, in which the operation of the navigation terminal output is possible only if the GNSS speed is zero, others did not even think about such a possibility, and still others simply made a special mark in the documentation.
What should an integrator do if a customer needs to install a navigation terminal with an engine blocking function?
Firstly, it is necessary that the contract contains an appropriate clause, or rather a separate appendix, in which it will be stated in plain text that all responsibility for using the engine blocking option lies entirely with the client. This application can be called "Disclaimer" or simply "Notice".
Secondly, you should not “stupidly” use the blocking schemes that manufacturers of navigation terminals print in their operating manuals. As they say, "away from sin."
We bring to your attention several such schemes.
Navtelecom
Galileosky
IRZ Online
Pay attention to the scheme from the Galileosky company. Here you can see the diode 1N5402 - 1N5408, designed for forward current 3A and reverse voltage up to 200 volts. This diode is necessary to protect against self-induction of the relay excitation coil, when a reverse current occurs when the voltage is removed from the winding. This current can be very dangerous. However, the fact that the diode is absent on other circuits does not mean at all that the equipment developers have not provided for protection against self-induction current. In any case, carefully read the operating instructions and follow the recommendations of the manufacturers.
So, what about blocking? Turn on your head and understand the basics of electromechanics!
Smart lock is possible!
In turn, we want to offer you a simple, reliable and, most importantly, safe engine blocking circuit for two 12 Volt automotive relays.
We suggest using two relays instead of one, as in the diagrams of manufacturers of satellite monitoring equipment.
The principle of operation of the circuit is as follows: the output of the navigation terminal in the disabled blocking state is shorted to ground, when the ignition is turned on, the left relay in the circuit turns on and self-blocks, passing the ground for the right relay through itself. The right relay turns on and closes the blocked circuit. When the navigation terminal is given a command to open the output circuit, both relays remain in working condition: the left one due to self-blocking, the right one due to the inclusion of the left relay in the “ground” circuit.
The integrity of the blocked circuit is maintained even if the terminal has already disconnected the left relay from the ground. During this time, the vehicle may be in motion. The lock will work when the ignition is turned off.
Once the vehicle is turned off, the circuits of both relays will open and will not recover when the ignition is turned on again. The blocking of the circuit will remain until the appropriate command is received on the terminal.
To implement the circuit, any diodes designed for a forward current of 3A and a reverse voltage of 200 volts (more is better) are suitable. For example, the domestic diode KD280V (similar to 1N5402). Relay try to choose from well-known manufacturers better than European ones. A good choice- relay from StarLine. The circuit must be protected by a fuse with a rating of not more than 2 Amperes (1 Ampere is enough).
Which circuits in the vehicle should be blocked? Here, sorry, everyone decides for himself.?
Using secure circuit engine blocking in the Wialon Hosting system, you can configure automatic engine blocking upon an event, for example, upon leaving the designated geofence.
However, colleagues, each car has its own way of blocking. Some, for example, simply remove the steering wheel. We, at the moment, are trying to use only circuits without relays and block the engine through CAN bus. But we will tell you about this later.
In this article, I will try to highlight the points associated with competent engine blocking, and not from the point of view of the correctness of electrical circuit breaks in the car, but from the point of view of the theft resistance of the locks themselves, that is, let's talk about how to get the most out of an ordinary alarm in terms of locks. But first - the necessary explanations on the topic - for most, the history of the issue may be useful.
So, as you know, modern car alarms have two important functions, for which they, alarms, are actually bought and installed on the most different cars. Important - meaning - in terms of countering theft, as well as in terms of protection from looting. The first function is directly to notify the owner and others about such attempts, and the second is to prevent, let's say stamped, unauthorized engine start, or, in other words, the start blocking function. Here about it, about blocking, and we will talk in more detail.
It so happened historically that the vast majority of alarms use relays as executive devices. This is probably why the motto of hijackers of all times and peoples today sounds like this - “Cherchet la relay”. Blocking relays can be built into the alarm module, or the alarm has special pins on the connector to control such a relay. Or very small, but high-quality and powerful relays are placed in the body of a regular automotive relay(as it can be seen in the photograph, Fig. 1), together with a control circuit that carries out switching according to coded commands coming from the signaling unit either through a special wire, or without any wire at all, but through switched circuits in the form of a high-frequency coded signal. It is clear that with the help of such “stuffed” relays, it is possible to organize the most secretive and difficult to neutralize blockages today, because their presence in a car does not give anything away, and hijackers must be highly qualified in order to find such small bugs in modern car, literally stuffed with various electrical devices and cables. However, alarms that can control wireless relays are much more expensive than the ubiquitous simple systems with conventional relay locks. But if you have the funds - to protect your car from theft, preference should be given to such not cheap systems, because the developers with this beautiful solution managed to give the installers a fairly effective solution to combat theft - a blocking relay controlled by the car's standard wiring (or even by radio channel) .
Why? Because the usual standard installed alarm will not be able to resist hijackers for more than a few minutes. And the reason lies not only in the standard and predictability of "mass installation", but also in the fact that the developers themselves did not pay enough attention at the time important function blocking the engine, even the name for it was invented offensively - “auxiliary”. "Well done", of course, what can you say - one built-in relay or even just one wire - that's all that is assigned to them for the implementation of this far from auxiliary, but the same main signaling function, along with notification.
Well, let's see - what can be done in order to correct the situation with "little bloodshed". To “look”, however, you need to have a good idea of what engine blocking algorithms are used in modern car security systems.
The engine blocking relay is an integral part of any anti-theft system. With its help, the vehicle is protected from theft by intruders.
Relay Features
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The operation of the engine block relay is carried out along with other functions and car alarm systems. An encrypted signal from an immobilizer or a central car alarm unit can be transmitted in three different ways. It can be transmitted by standard wiring, a separate dedicated channel or radio transmission.
The most common is the use of digital relays, which use standard wiring for data transmission. The wiring is characterized by the presence of an analog channel, which provides high speed signal transmission. Its passage is carried out almost along the entire perimeter of the vehicle. When sending a signal by a car alarm, the code is checked for legitimacy, as well as 
signal transmission to the owner of the vehicle on the phone or equipment key fob.
Features of the alarm
Almost all modern car alarms are characterized by the presence of shock or tilt sensors. During the period of their operation, the relay blocks the engine, which makes it impossible to move on the vehicle. The device can be activated remotely. This function can be activated promptly for one trip only. Disabling the device from the armed mode is carried out in two steps, which guarantees maximum reliable protection. If necessary, connect personal code which greatly enhances security.
In the cabin, the light is delayed for several minutes after the device is set to armed mode. The alarm system is a universal security system with which you can fully protect the car from intruders. The equipment is characterized by simple design, which makes it easy to install. With this equipment, the trunk can be opened from a distance. Full-fledged work of the security complex is carried out at a temperature of -40-+85 degrees, which allows it to be used in harsh climatic conditions.
The main unit of the device is small in size, which allows it to be installed in any place of the vehicle convenient for the car owner. It is quite simple to execute it. Initially, it is necessary to connect all the wiring in accordance with the diagram. After that, the equipment is configured. Due to the presence of power outputs to the car locks, the doors can be locked or unlocked at the request of the vehicle owner. With the help of the special Jack mode, all security functions can be turned off as soon as possible.
The equipment is equipped with an immobilizer, which provides it with excellent anti-theft qualities. In order to limit vehicle theft, the fuel supply may be cut off, the transmission switched off, or an electrical circuit opened. If there is a need for emergency shutdown, then the person can use a personal pin code. Also, two additional channels can be programmed on the device. Convenience during the use of the equipment is provided with the help of additional power outputs for locks and turn signals. With this equipment, certain channels can be set remotely. The equipment is a universal security complex, which guarantees a high level of vehicle security.
Advanced alarm options
The equipment is equipped with a special mode, which determines the presence of two-way communication. IN emergency situations it bypasses faulty zones, which provides it with a long and smooth operation. A device with auto start can check the temperature inside the car from a distance. Thanks to the silent guard mode, the most convenient control is guaranteed car alarm.
The security functions in the equipment are performed automatically, which guarantees convenient use of the device. It is possible to install security sensors on five independent zones. When operating the equipment, the user receives sound alerts, with the help of which his actions are confirmed. The instruction manual gives information that when using this equipment, two key fobs can be controlled simultaneously.
Thanks to the presence electronic system protection in the equipment excludes the possibility of its software hacking. When using a key fob, any of its buttons can be blocked. It also provides the ability to simultaneously block all buttons. The immobilizer is effective anti-theft system. It only takes one button to control it. When you try to steal a function car, it is immobilized.
The car alarm can shut off the fuel supply, open electrical circuit or disable the transmission. Signaling can be instantaneous or after a certain time has elapsed. Locking and unlocking the doors at the request of the car owner can be carried out due to the presence of power outputs to the locks.
Equipment design
The engine lock relay system is characterized by a fairly simple design. This is a small box made from plastic. It is a block with which the automatic blocking of the motor is activated at a distance. The unit consists of an electronic board and relay microcircuits that control certain vehicle sensors.
Module automatic lock also consists of a set of wires. They are used to connect the standard electrical wiring vehicle and autostart system. Due to the small dimensions of this device, its installation can be carried out in any convenient place in the car. The location of the box should be characterized by the presence of points through which it will be connected to the standard wiring of the vehicle.
The operation of the automatic blocking of the motor can be carried out using one of two modes: remote or automatic. Using automatic mode You can set the engine blocking time using a timer. Its programming can be carried out according to the temperature in the cabin, the set time, the engine temperature. Remote control of the vehicle engines is carried out by the car owner at a distance. For this purpose it can be used as mobile phone, and a car alarm keychain.
The block of autoblocking can be connected according to two schemes. In the first case, an autonomous connection is made along with a car alarm. Such a connection scheme is used if the vehicle is characterized by the absence of a security system. IN this case connection of the device can be carried out to cars with turbocharged or atmospheric, diesel or gasoline. The operation of such a module can be carried out automatically or mechanical box gears.
Installation of auto-lock can be carried out by a master without relevant experience due to its simplicity 
this procedure. For this purpose, an automatic blocking module is used, as well as an immobilizer crawler unit. You can also use a car alarm that has this function. If you need to install an auto-lock system, you can seek help from specialists.
Removing the system from the auto-lock function
A distinctive feature of the autorun scheme diesel engines is additional connection glow plug control circuits. In this case, when the block enters auto start V security complex initially carried out automatic shutdown blocking the car alarm, and after that the ignition and starter are activated. At offline installation The autostart block is initially treated by the immobilizer, and after that, the module supplies power to the ignition and starter circuits.
Bypass standard immobilizer is enough important operation during the installation of the automatic start module. This is due to the fact that one of the functions of the anti-theft system is to break the electrical circuit (or several of them). This affects the start of the vehicle's engine. That is why during the installation period, a block is installed that has a digital microcircuit. It helps to eliminate conflicts between such aggregates as anti-theft device and autostart. In most cases, this unit is a spare ignition key. An immobilizer deactivation chip is installed in it.
Regardless of whether the automatic or remote control principle has an automatic start system, it is characterized by an identical operation scheme. At the set time or during the period of receiving commands from the remote control remote control or from a mobile phone electric current to the ignition circuit from the automatic start module. After that, within two seconds, the oil pressure level in the line is restored. At the next stage of equipment operation, the starter is turned on.
Almost all security systems are equipped with an automatic engine blocking system. With their help, the possibility of car theft is limited.
