How to disable the immobilizer. The immobilizer has blocked the engine from starting: what to do?

Immobilizers are found in almost every modern car. The purpose of this device is to protect the car from theft, which is achieved by blocking the electrical circuits of the systems (fuel supply, ignition, starter, etc.). But there are unpleasant situations in which the immobilizer blocked the engine from starting. What to do in this case? Let's talk about this.

Why is the immobilizer disabled?

The main reasons for turning off the device are:

• Lost key. Since it is impossible to start the car without it, the problem can only be solved by turning it off.
• Failure of the system or its individual parts. If software or hardware failures occur in the device, drivers most often encounter a problem when the immobilizer has blocked the engine from starting.
• The immobilizer does not see the key. In this situation, it will also not be possible to start the car and the immobilizer firmware will be required.
• Desire to start the engine remotely. The autostart function is especially helpful in winter, but it is incompatible with the standard anti-theft system.

A burning light on the panel will indicate a problem with the device.

Code deactivation of the immobilizer

Read more about how to turn off the immobilizer using a password using the example of a Lada Kalina vehicle:

1. The car's ignition is turned off. The lock indicator on the instrument panel should blink slowly.
2. The ignition system is activated. Some icons should appear and disappear on the control combination. The engine immobilizer indicator will flash rapidly.
3. The vehicle's central locking (CL) control key is pressed and held. The immobilizer icon should stop blinking on the instrument panel.
4. When the central locking button is pressed, the blinking intensity will decrease. The user needs to count the number of flickers and release the key at the moment when their number matches the first digit of the password.
5. The steps to enter the code are repeated.

An example of disabling the engine blocker on the Lada Kalina model is given in the video of the channel “Elm327 Equipment for car diagnostics”.

How does an immobilizer differ from a regular alarm system?

The main difference between an immobilizer and an alarm system is its shorter range of action and a more advanced, one might say, intelligent principle of protection. All this significantly reduces the likelihood of car theft.

For example, in order to intercept a signal coming from the key fob of a conventional security system, an attacker can be located at a considerable distance from the car - several tens of meters.

This will not work with an immobilizer; to intercept the signal you need to be directly next to the car, and this limits the possibilities of car thieves significantly.

Another advantage of the immobilizer is the almost impossibility of copying it, because for this you will need a special master card, which cannot be said about alarm key fobs, which in our time, by knowledgeable people, can simply be duplicated.

Video

The “Disable Immobilizer” channel spoke in detail about the features of self-assembling a car engine blocker bypass.

Do you have any questions? Specialists and readers of the AUTODVIG website will help you ask a question

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Device types

Now there are three main types of immobilizers:

1. Protective while moving (engine blocking while moving);
2. Contact (the most common);
3. Contactless.

The first type of immobilizers is characterized by a greater range of action, thanks to a more powerful board and antenna. Its task is to block the engine while the car is moving.

The device is actively used not only by various financial and other organizations, but also by individuals.

The bottom line is that if instead of the rightful owner, as a result of violent actions against him, there was another driver, it would be possible to block the engine while driving at a great distance. The main thing is that the control key fob remains with the owner of the car.

True, this can also be done with mobile systems via a smartphone or GPS control systems, for example, car satellite search modules.

The second type (contact immobilizers) requires the presence of a special reading board in the ignition switch and a key with a chip in which a unique code is stitched.

The disadvantage of such devices is that losing or getting the key into the wrong hands can lead to unpleasant consequences. Therefore, some car owners are forced to spend money on installing additional security measures, such as fingerprint scanning devices or a small keyboard for entering a code.

The third type is contactless immobilizers. They are more reliable in terms of protection than contact ones. The fact is that the basis here is a special chip that sends a signal from a short distance (up to 0.1 meters) to the receiving board.

The chip can be mounted in any unattractive thing, and the board can receive a signal through an antenna placed in any place known only to the owner of the car. Those. if the chip falls into the wrong hands, you also need to know where to put it in order to start the car.

Nowadays, most new car models come with standard immobilizers. They are installed at the factory, and therefore these devices are maximally integrated into the electronics and design of the machine.

But if they do not meet the car owner’s safety criteria, you can additionally install another immobilizer as an anti-theft device.

(adsbygoogle = window.adsbygoogle || []).push({});Car immobilizers are divided into two types:

1. Contact - which requires a contact key to activate.
2. Contactless - a transponder or tag card is used for activation.

There are also code models; to (de)activate them, you need to dial a certain combination on a special panel.

We can’t help but mention the super-sophisticated systems that work with the owner’s fingerprint.

The principle of operation of the immobilizer is close in similarity to the operation of the alarm system, but at the same time it has many fundamental differences. Cool anti-theft systems boast quite a wide functionality; they are able to track the car’s coordinates via satellite, and also inform their owner about unauthorized entry. As for the immobilizer, everything is much simpler and more modest; its main task is to interfere, to prevent the engine from starting and the movement of the car. The immobilizer's coverage area is small, only a few meters or even centimeters in some cases. A characteristic feature that I mentioned earlier is the location of the immobilizer, it is as hidden as possible, and in order to find it it will take more than one hour, and maybe even a day... Sometimes it is impossible to find the immobilizer even by wire; the operation of such “encrypted” systems is built through a standard electrical network on special high-frequency waves, in many cases the components of the immobilizer can look like ordinary automotive equipment.

Microimmobilizers (relays) can also be carefully disguised as certain devices or parts. For example, a microimmobilizer relay can be made in the form of a simple fuse and installed in the unit without attracting attention. The time it takes to search for sensors and relays is a characteristic trump card of this device; in order to find and neutralize a dozen such microdevices it will take several days.

There are also immobilizers that delay the start of engine blocking; this is a kind of trick or a trap for a car thief. This system works as follows: after breaking the car’s lock, the thief successfully starts the car and quietly “makes his feet”, but after a few hundred meters the stolen car suddenly stalls

A car stopped on a busy highway will one way or another attract the attention of others, and the would-be car thief himself will either have to start fiddling with the reason for the stop right on the road (which is completely impossible) or go on the run

Modern models of immobilizers are equipped with a transponder system, which minimizes the possibility of car theft; it becomes almost impossible for thieves, with all their skill, to do this. To deactivate or neutralize this system, it is necessary to go through the car almost to the ground. The transponder system has a contactless operating principle. The owner of the car carries with him a special key fob, or card, which contains a highly complex coded code. After the owner gets into the car, the key fob with the code falls into the range of the receiver, which reads the code. After successful authorization, the immobilizer is turned off, otherwise the car continues to remain locked.

As with microimmobilizers or relays, the difficulty for attackers is that the receiver is very difficult to find. It is disguised in such a way that an unknowing person can never detect it. The location of the receiver can be anywhere, from chairs and upholstery, to the panel of a device or in the body of the device itself. The receiver does not manifest itself in any way, so it is almost impossible to detect or find it using technical devices.

Immobilizers are produced by such companies as: Green Bux Pandect, Geolink Electronics (Black Bug), Sheriff and others.

Installing this type of protection is a complex and responsible procedure that requires high professionalism and extensive knowledge about this device. It is recommended to install immobilizers in certified service centers that have experience in installing these devices and can guarantee you quality and further service.

How the immobilizer works, design features

To figure out how to unlock the immobilizer, you need to understand what it consists of and how it works. Let's look at the example of a contact type device.

The main structural elements of the immobilizer: electronic control unit, control system with a coil, actuators, programmed chip (transponder).

1. The basis of the ECU (not to be confused with the main electronic unit) is a microcircuit into which a special action program and exchange code are sewn. The latter queries the key to determine whether it belongs to a specific car.
2. The task of the coil in the control system is to quickly read all the information from the key. It is built into the ignition switch.
3. The task of the actuators is to interrupt and send signals to the electronic systems that control the fuel supply, ignition and starter. It is also possible to use them to activate an additional electromagnetic system with the help of which the mechanical elements of the car are blocked.
4. The chip is a transponder, located in the ignition key. It has a unique code stitched into it that the ECU recognizes. If the code does not correspond to a specific car, then the electronic unit will not give the command to start the engine.

Some immobilizers can work without the driver's participation, protecting the car from robbery, but this applies to expensive models.

Due to their compactness, modern immobilizers are installed so hidden that it is almost impossible to identify them, much less their type, which gives them another plus.

How it all happens

Let's look at the example of Lada Kalina, Priora, Grant, Niva Chevrolet cars that have a standard APS 6 immobilizer installed.

As we know, the ignition key has a transponder chip with a unique code, this applies to both the training key with a red mark and the working one.

When you insert the key into the ignition using a coil located nearby in a circle, the code is read from the transponder chip. The information is immediately transmitted to the APS block 6.

This block compares the received code with the code that is located in the computer in permanent memory.

If the codes match, then the APS gives permission to start the engine. Otherwise, you will not be able to start the car.

How to make a crawler yourself?

Any immobilizer bypass imitates a signal received for unlocking. You can make the device yourself using a control relay, a complete tag, a second key and a wire.

1. The key and tag perform the task of simulating engine unlock signals.
2. An electromagnetic coil is made from wire, with the help of which access to the on-board network is provided.
3. The control relay automatically sets the unlocking response time.

Everything should work by default when the module is active or automatically.

Principle of operation

The immo's task is to prevent an attacker from starting a car in order to steal it. The device body is small in size and is located in places that are difficult to break into. If a standard alarm can only scare away a thief, then the immobilizer does not allow the car to start if the person does not have a special electronic key (tag).

There are 3 groups of protective devices:

• contact;
• code;
• contactless.

Contact and code immobilizers give away their location to an attacker due to the presence of a reader or device for entering a code. To start the motor, you need to enter a code or touch the chip to the contact pad. These devices will only prevent the engine from starting during initial startup. This protection mode resembles the operation mode of a secret button. Installing a secret button is cheaper than the cost of these devices, so they have not gained much popularity.

Modern Russian cars are equipped with standard contactless immobilizers, in which a chip with a code is located in the ignition key. The protection device works as follows:

1. The driver inserts the key into the ignition switch; when the key is turned, current from the on-board network is supplied to a coil of copper wire wound around the lock.
2. The generated electromagnetic field pulse, propagating in space, induces current in the microantenna, which is located in the ignition key body, and charges the capacitance that supplies voltage to the chip containing the code.
3. The complex electromagnetic signal generated by the chip is transmitted back to a coil wound around the ignition switch. The code in the form of an electrical signal is sent to the immobilizer, which carries out the recognition procedure. If the immo confirms the authenticity of the code, it sends a command to the electronic engine control unit (ECU) to start the car engine.

This type of protective device tests the chip once when the engine is started; more advanced immobilizers have a “WAIT-UP” relay that does not block engine operation when the vehicle is not moving. This anti-theft system tests the chip at specified intervals.

If the car starts moving and there is no chip with a tag inside it, the engine will be turned off.

Such systems operate at 2.4 GHz, are miniature in size and are located in a wiring harness to hide them from intruders. The tag is equipped with a battery, and it is tested by the anti-theft system at a specified frequency. The encoded chip should be stored separately from the ignition key. This increases the vehicle's protection from possible theft. If the driver is forcibly removed from the car, the engine will stall after a preset time.

Direct immobilizer control

The driver's direct participation in protecting the car from hacking security systems is not a crazy idea. The more automated the control system of a car's anti-theft device is, the greater the likelihood of it being hacked by various electronic scanners.

The most exclusive version is considered to be an immobilizer with a built-in special sensor that scans the car owner’s fingerprint. The method is quite interesting, and can create high reliability of the immobilizer when security conditions are met, without leaving fingerprints anywhere in common places for a thief. However, this cannot always be done.

Therefore, in expensive foreign cars, simple push-button devices are installed, in which the immobilizer is repeated with a digital code that is entered manually by the driver. In this case, you don’t have to look for how to externally identify the immobilizer. However, choosing a digital sequence yourself is quite difficult and requires a lot of time. The code in the microcircuit can change after each engine start or after a long period of parking with the engine running.

Another type of driver’s work in implementing the option of protecting the car from penetration into the interior is the use of special wearable or individual keys with a built-in chip.

A transponder chip or card can be inserted into a wristwatch or plastic card, or any personal item, without anyone noticing where it is. The immobilizer control board is capable of controlling the key remotely.

There is a method that is the answer to the criminal “parachute” method of car theft. In this case, the car thieves select the moment when the driver stops at a traffic light for a few seconds after starting to drive. At this moment, the driver is suddenly attacked and thrown out of the car with the engine running. If the anti-theft system is working, then the car will not be stolen unless the driver voluntarily tells or gives up the key, since criminals do not know where the transponder is located.

This is how many BMW X5 models were stolen in Russia. The control key to the car was taken away under threat, so the immobilizer is not able to guarantee good resistance to criminals.

If the engine is blocked from starting

On domestic cars, there are often cases when, due to the appearance of various malfunctions, the immobilizer system begins to fail, the immobilizer lights up on the panel, preventing the vehicle’s engine from starting.

If the car does not start, you can use the emergency immobilizer shutdown procedure by entering a special code into the electronic engine control unit by pressing the accelerator pedal in a given sequence. Each car model has its own instructions for this procedure, developed by the vehicle manufacturer.

Causes

A faulty immobilizer blocks the engine from starting and prevents the driver from using the vehicle for its intended purpose. What can lead to immobilizer failure:

• a dead battery in the identification chip in the immo operating on a radio channel;
• failure of the chip with the code, which is built into the key;
• damage and breakage of the coil wound on the ignition switch;
• damage to the electrical circuits powering the immobilizer or connecting it to the electronic engine control system;
• damage to information in the read-only memory (ROM) of the anti-theft system or engine ECU due to powerful electromagnetic disturbance;
• starting the starter and engine ignition system when the battery is insufficiently charged;
• removing the terminals from the battery with the ignition on.

What to do

If the immobilizer has blocked the engine from starting, you must do the following:

• If you suspect that the battery in the identification chip is low, use a duplicate or replace the battery in it. In cars of medium and high price categories, there is a special slot in which, when placed in it, an electronic key with a discharged battery will work.
• When purchasing a car, the driver is given 3 keys. 2 working black and 1 training with red insert. The chips of the working keys are registered in the memory of the anti-theft system, and with their help you can write 5 more keys into it yourself according to the factory instructions. Having spare chips will eliminate the problem of their failure.
• Unlocking the engine ignition system in the event of failure of the power supply circuits of the immo and engine ECU will occur when the fault is repaired by an auto electrician.
• An open circuit in the pumping circuit at the ignition switch can be checked using an additional emulator connected in parallel via a diode and a relay to the main coil. If it works and the engine starts, then the coil has failed. You can also check it “for an open circuit” using a multimeter, after first disconnecting it from the electrical circuit.
• Unblocking engine starting if information in the ROM of the electronic engine control unit or immobilizer is deleted or damaged is only possible after deleting the damaged data and flashing the memory using special equipment and software.

Unlocking the immobilizer on Lada cars

Lada Kalina, Priora, Granta, Niva Chevrolet cars are equipped with a standard APS 6 immobilizer. The problem of engine start blocking may arise due to its malfunction.

If the immobilizer is faulty, then, as mentioned above, 6 seconds after an attempt to start the engine, a flashing indicator in the form of a car will appear on the instrument panel for 20 seconds and groups of signals will be heard.

A group of signals can contain from one to four sounds, each of which indicates a specific malfunction:

One signal (duplicated after 6 seconds) - the code in the key chip cannot be read due to a failed transponder or communication coil.

To check the immobilizer coil, you need to measure its resistance, which should be in the range from 6 to 8 ohms. To do this, remove the decorative casing around the steering column.

There, find a block with white and blue wires and measure the resistance on them with a multimeter.

If everything is in order with the coil, then you need to ring the circuit further from the ignition switch to the APS 6 control unit. To do this, we place a plug between the contacts of the white and blue wires.

We remove the main block from the immobilizer unit (to do this you will have to disassemble the front panel) and use a multimeter to test the circuit through pins 1 and 11.

If you suspect a transponder chip in the key, then disassemble it and make sure that the chip is present and the integrity of all elements, including contacts.

Sometimes, if damage is detected on the board, soldering it helps to unlock the immobilizer.

If the problem persists, you will have to purchase a new remote control and train it using the master key (with a red mark).

If the master key also fails to start the engine, then the situation has become more complicated. Check if there is a chip in it and how it is designated. For the above mentioned car brands it should be designated PCF7936AS.

Next, you need to check the condition of the key with a specialist, and he will tell you whether this one can be fixed or whether you need to buy a new one.

If a new blank training key was purchased, then you need to clear the ECU memory from the program code that corresponds to the old key and retrain the system again. If it is not possible to clear the memory, you will have to purchase a new ECU, which is not so cheap.

Also, a malfunction may occur in the APS 6 immobilizer unit itself. To verify this, you will have to install another unit that is guaranteed to be in good working order.

But it is important to know that the newly installed unit will need to be trained using the red mark key.

If the APS unit is faulty, it is usually replaced with a new one, since repairing the old one is not very effective.

For greater clarity, the pinout of the APS 6 block contacts is shown below.

Two beeps (repeated after 6 s) - there is no connection between the engine control system controller (ECM - located in the ECU) and the APS control unit.

Controllers January 7.2 and M 7.9.7 are most often installed on the ECU of VAZ series cars.

In this situation, you need to check the W-line by dialing. This line connects pin 18 on the APS 6 immobilizer unit and pin 71 on the ECU controller (January 7.2 and M 7.9.7). To do this we use a multimeter.

There may also be no power supplied to the APS control units and ECU. For controllers January 7.2 and M 7.9.7, check the voltage 12V:

• on pin 12 from pin 30 of the ignition switch.
• on pin 13 from 15 of the ignition switch contact.
• on pin 44, 63 from pin 30 after the main relay.

The APS 6 power contacts can be found in the pinout diagram shown above.

If voltage is supplied to the blocks, then we proceed to the next stage of testing - a malfunction of the internal circuits along the W-line to the KSUD and APS 6 blocks.

To do this, you will have to replace the units being tested with ones that are known to be good. You will have to teach the APS 6 immobilizer unit again using the red key.

As for the ECU, it must be clean without codes for other keys written in it. And we also train him. If the serviceability goes away, then the problem was in one of the blocks.

IMPORTANT: If only one block was replaced, then training can be carried out with the old key with a red mark, since information about it is stitched into two blocks at once (APS and ECU). And if two blocks are replaced at once, you will have to purchase a new training key with a red mark.

Three signals. The key is not for this car, although it can be read or is not in the APS memory.

If, when using a regular key, the immobilizer light is constantly on and three beeps are heard, then the system is not trained and it simply needs to be trained with a key with a red mark.

If, when using a training key with a red mark, the indicator also flashes and 3 signals are heard, this means that either it or the APS unit are considered foreign.

In the case of the APS 6 block, it needs to be trained with its main key, the one for which the code is registered in the KSUD memory.

If the system considers the key to be foreign, then you will have to clear the KSUD memory, purchase a new one or a chip for it, and retrain the entire system with the old key. In this case, it is better to contact specialists.

Four beeps and the immobilizer indicator is flashing - the ECSC has already been trained for another system, and it does not give permission to start the engine.

To solve the problem, you will have to programmatically clear the memory of the ECU controller from the old key and retrain the entire system again. Or purchase a new KSUD and also train it.

Disconnection methods

There are several ways to remove the engine start lock by disabling the immobilizer.

Code deactivation

Emergency shutdown of the immobilizer is provided for by the standard factory procedure. The instructions were developed by manufacturers of domestic cars and are included in the vehicle documentation. If you carry out this process, the anti-theft system will turn off until the next time the ignition is turned on. The system allows the engine to start within 5 seconds after it is turned off.

For example, when locked, the Priora will start if the driver has activated the immobilizer emergency shutdown function in advance and written the access code into the system memory. The driver performs the manipulations by turning the ignition on and off, pressing the accelerator pedal according to a given algorithm.

Let's figure out how to bypass the immobilizer and what you need for this.

Using a spare key

When placing a spare key in the car, you can disable the anti-theft system yourself. To do this, you need to find a place as close as possible to the pump circuit of the chip, and attach a spare key with an encoded chip there. When you turn on the autostart system or start the engine with a simple key, the system will always detect the presence of a chip in the car and start the engine.

Use of special programs and devices

You can disable the immobilizer on a Man car only using a programmer and a computer. Using special software, the chips of the electronic engine control unit are interrogated, information about the presence of an immobilizer is cut out from them, and the car’s brains stop responding to its signals.

Engine lock

There are several methods for disabling the immobilizer: using the main lock control button and using an IR transmitter. If the device suddenly stops the operation of the vehicle, then using the IR transmitter you can unlock the car in which it affects the main lock and immobilizer. To disable the standard immobilizer, you need to set a 4-digit code. It is entered on a special panel by pressing the gas pedal and the built-in computer control button. Most often, this button is placed at the end of the switch or next to the glass cleaner.

What is an immobilizer bypass and why is it needed?

The device consists of 2 loop antennas connected via a relay. One antenna loop receives information from the transponder located in the reading module, and the other sends it to the ignition switch (IZ). If the car is started with the key, the relay switches and the immobilizer (IMMO) is activated directly. If a command is given from the car alarm unit, the circuits are switched in such a way that information from the transponder is sent through the 3Z loop to the IMMO, which gives the command to start the engine.

Where is?

The standard IMMO is installed in the same place for all cars of the same brand. This is due to assembly line production. In Russian cars it is located:

1. Lada Kalina. Located behind the dashboard, car radio and ventilation control drives.
2. Lada Granta. It is installed behind the dashboard where the ignition switch antenna wires lead.
3. Niva Chevrolet. Located in the center console near the driver's right foot.

Almost all cars have an immobilizer located behind the dashboard. A safe place to install the device is the engine compartment with a lockable car hood.

Types of devices

To bypass the standard IMMO, two types of devices are used: key and keyless. The first involves the use of a standard key or transponder located in a special device in the module. Based on a signal from the key fob or a command from the security system, data is transmitted from the lineman to the standard IMMO. In a keyless device, the order of pulse transmission occurs at the software level and does not depend on the chip.

The devices transmit information via CAN/Lin bus or special devices. Option 1 is the simplest and does not require additional investments. However, not all cars are equipped with such a tire. In the second case, the list of car models is much wider, and the linemen themselves are equipped with additional functions.

Cars from European and Asian manufacturers use IMMO with radio frequency identification (RFID). Here, data stored in the transponder is read or written using radio signals.

Devices using the VATS principle and installed on American cars use keys with a resistor. The decoder receives a signal in the form of a resistance of the set value and unlocks the engine start.

How to disable Immo

Many questions concern how to disable Immo on Starline if this option is no longer necessary. Take the following steps:

• Click and hold button 2 (on some models of security systems, button 3, for example on b9) until two signals appear. First the music, and then a short one.

• Pay attention to the display. On it, after two signals appear at the bottom, the first icon on the left side is highlighted.
• By briefly pressing buttons 2 to move to the left (sometimes 3) and 4 (to the right), move the cursor to the desired image.

• If the question is how to remove Immo on the Starline alarm system, press button 1 to confirm.

If everything was done correctly and you were able to disable the option, the machine should give two light signals. As for the keychain, it will play one melody and two short sounds. After exiting programming, the icons are not highlighted. This indicates that you managed to disable the Immo mode on Starline.

If all else fails, press the service button.

What is an immobilizer bypass?

The immobilizer bypass consists of two antennas operating through a switch, which is a relay. One of the antennas is used to read the signal from the key hidden in the car, and the second is used to transmit this signal to the ignition switch. The relay ensures the operation of the immobilizer circuit directly (when the key is in the lock) or bypass, after receiving a signal from the security alarm unit. In this case, the signal from the hidden key goes to the antenna in the lock, and then to the immobilizer control unit, which allows the engine to start.

Four methods are used to bypass the immobilizer circuit:

1. Installation of the bypass control unit using the original car key. The key is placed in a special container that reads the signal and transmits it to the lock. The container is located in the dashboard of the car in a hard-to-reach place. This solution reduces the security of the car, since an attacker can find the key and steal the car.
2. Using a control unit using a copy of the chip from the key. This is a more reliable solution because the copy of the key does not have the bit part.
3. Installation of a special programmable module that emulates the signal from the chip.
4. Complete disabling of the immobilizer. It was used on the first machines with such a device. Currently, the method is not used, since it is impossible to disable the immobilizer on modern cars.

The negative current pulse that activates the relay arrives only in autostart mode. During a standard engine start, relay contacts 30 and 87A are closed, connecting the standard antenna. In this case, the immobilizer unit reads data from the key installed in the lock. In autostart mode, the relay connects contacts 30 and 87, excluding the standard antenna from the circuit and activating the crawler.

In the case when there is only one key for a car, and it is impossible to make a duplicate chip, a scheme is used that involves installing a tag on the ignition switch. Then the car will be started with a regular key that fits into the ignition switch. Alternatively, a single key is placed in the walker unit, which is connected through a special relay. It allows you to activate immobilizer bypass both during auto start and when the car is disarmed. To start the engine, a copy of the key without a chip is used.

Description of RFID and VATS systems

The principle of operation of the anti-theft system is to block the ability to start the engine if certain conditions are not met. This may be necessary in case of loss of the key, incompatibility between the operation of the standard alarm system and the one installed additionally, for remote or automatic engine starting. Factory immobilizer bypass devices not only serve their intended purpose, but also have a CAN bus to increase functionality.

But is it possible and how to deceive the immobilizer without buying a factory lineman? This problem can be solved in several ways. The main condition is to preserve the original functions of the car alarm. Installing additional components or upgrading the system should not affect its functionality and reliability.

To choose the optimal scheme for a homemade lineman, you need to know the types of immobilizers. They differ in their operating principle, on the basis of which methods of temporary or permanent shutdown are developed:

• RF > transponder (transmitter), which, when activated, sends a signal to the system and activates it. The receiving part is located in the ignition switch design;
• VAT. Typical for American-made models. Inside the ignition key there is a resistor that has a certain resistance value. To turn on the engine, you must insert the key into the lock. If the resistance value differs from the normalized value, the engine will not start.

For each of the systems, it is necessary to develop a universal model of an immobilizer crawler, which is not difficult to make with your own hands. It is important to know the principles of design and selection of components.

Methods for bypassing RFID system immobilizers

The presence of a standard immobilizer is the main reason for using additional means to bypass it. It cannot be removed and therefore it is necessary to properly think through the scheme of the future crawler.

When drawing up a diagram, the following conditions must be met:

• Universal connection and no negative impact on the operation of the car alarm;
• Adaptation for a specific immobilizer model. Be sure to first study its structure;
• Retaining the functionality of standard keys to start the ignition.

Standard immobilizer models can be installed in the ignition switch or on the engine start keys. This is where the system is being upgraded.

Manufacturing an RFID immobilizer crawler

The most common way to bypass the immobilizer using a DIY device is to install an additional circuit on the ignition switch. At the same time, the remote functions of the immobilizer will remain. Its operation will be disabled when the key is installed in the ignition.

To make a loop for a reel, you need to prepare a thin case, which will subsequently be mounted on a lock. Most often it is made from cardboard. Then you should follow these steps.

1. Check the inner diameter of the lineman. It should be slightly larger than the size of the lock core.
2. Scotch tape or electrical tape is installed on the outer part of the mandrel. Its adhesive part is on the outside.
3. Then you should disassemble one coil of the automotive relay. The wire from there is wound onto the winding. The number of turns is usually 20-30 pcs.
4. The resulting structure is installed on top of the ignition switch.

A similar design must be made for the spare key. He subsequently hides in the car. The components in the system are connected according to the following diagram:

In some cases, this method is not applicable due to the small space for installing the immobilizer crawler. Then it is necessary to use alternative methods.

Upgrading the RFID immobilizer bypass circuit

To begin with, a relay is made, consisting of five contacts. It is necessary for the proper operation of the structure.

But if it is impossible to install a loop on the ignition switch, the circuit should be modernized.

When started using the key, power is not supplied to the homemade relay. Consequently, the operation of the standard immobilizer is not disrupted.

In addition to the above-described principle of constructing a crawler, more complex ones can be used.

They almost completely eliminate the possibility of spontaneous engine shutdown when switching from autostart of the car to the ignition key.

Pros and cons of the mode

Above we looked at what the Immo function on the Starline key fob is and how to disable it. But do not rush to deactivate it, because before that you need to study its positive and negative qualities. Perhaps the function is useful and there is no need to disable it.

Advantages:

1. Possibility of using Immo on Starline as primary or additional vehicle protection. For example, if conventional security systems simply warn about a break-in, the immobilizer blocks the operation of the vehicle and prevents it from being stolen.
2. Automatic activation of the option. If the owner does not take any action within a certain period of time, the immobilizer on Starline works independently. This is useful for forgetful car owners.
3. Transponder keys do not depend on the presence of power and operate in passive mode. This means that you don’t have to worry about the battery draining.
4. Easy to connect. With minimal knowledge of electronics, you can do the work yourself.

Flaws:

• From time to time, malfunctions may occur in the operation of the device. In this case, the question arises of how to disable the Immo mode on Starline E90 or other models. This may be due to interference from a smartphone or other devices.
• Difficulty turning off if the key fob is lost. You will need to use a service button.

Now you know what Immo is on the Starline key fob, what functions the immobilizer performs, and how to disable it. In the comments, share what difficulties you encountered during operation, what caused them, and how you managed to solve them on your own without contacting a service station (or with the involvement of specialists).

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Many drivers have encountered a breakdown or malfunction of the alarm system (security/anti-theft system, anti-theft), which is why they were unable to use the car normally. Often, due to errors in the operation of this system, the driver cannot even get into his car because the doors are locked. Even if he managed to get into the salon, it is very difficult to start such a car in order to get to the repair site. After reading the article, you will learn how to turn off the car alarm and not damage the car.

Anti-theft device and what can happen to it

Cars have always been in demand among car thieves, so automakers have seriously thought about how to protect buyers from trouble. A special anti-theft device was invented and developed - an immobilizer, which electronically deprives the car of the ability to move.

Car immobilizer in the form of a key fob

However, sometimes the system crashes, causing the device to become blocked. In such cases, whatever one may say, the system requires mandatory unlocking, otherwise your car will never move. Let's try to figure out how to disable the immobilizer so that you can freely hit the road.

How to start the engine if the alarm does not work

Almost all modern alarm systems allow you to disable the standard security system, even if the remote control is faulty. To do this, a “secret button” is installed in the car. This button, after a certain number of presses, produces an emergency shutdown of the alarm system, including the immobilizer. This function is described in more detail in the documentation for the anti-theft system, in the section “how to turn off the alarm.” If you have a GSM security system installed, connected to the dispatch service, call the operator, identify yourself and the code word and ask to turn off the alarm in the car or disarm the car.

What to do after starting the engine

After you have successfully unlocked the anti-theft system, deactivated the immobilizer and started the engine, you need to take the car to a service center or workshop for inspection. Without this procedure, your car is defenseless against car thieves, because you will not be able to turn on the anti-theft normally and then turn it off normally. There is always a small chance that the alarm's malfunction is caused by damaged wiring or a short circuit. This may damage the on-board electronics and cause the vehicle to catch fire. Therefore, do not delay in diagnosing, repairing or setting up the anti-theft system, otherwise next time you will have to deliver the car to a service station using a tow truck.

Sources used:

• https://adact2.ru/a/otklyuchenie-immo
• https://avtodigitals.ru/immo-na-brelke-starline-kak-otklyuchit/
• https://autolirika.ru/soveti/kak-otklyuchit-signalizaciyu-na-mashine.html

What to do if the alarm doesn't work

If you tried to disable the alarm using the key fob, but nothing happened, make sure that you are standing near your car. The author of the article knows of cases where people tried to open the doors of someone else's car of the same brand and color using a key fob and, after several minutes of torment, discovered that their car was parked in a different place. Once you are sure that you are trying to unlock your car, call the company that installed your anti-theft system and ask them to send a specialist. If you installed it yourself or in a small workshop that did not provide a guarantee for its work, then first of all you need to check the key fob battery.

If you have a GSM anti-theft system installed, then if the key fob malfunctions, you can disable it using SMS from a special application on your phone, smartphone or tablet.

Despite the fact that many times on the Internet it is advised to remove the terminals from the battery, this will not help. Firstly, you can only open the hood from inside the car, and secondly, the alarm is connected to a backup battery and it is very difficult to remove or disconnect it.

How to check the key fob

• Remove the cover of the alarm key fob and remove the battery. Inspect the contacts. If there is plaque, rust or other dirt on them, clean them.
• Bend the contacts a little so that they are pressed more tightly to the battery.
• Then reinsert the battery (do not reverse the polarity) and try to disable the security system.

If this does not help, buy and insert a new battery and try to deactivate the alarm again. If you do not have the opportunity to replace the battery, then knock it on the curb several times so that small dents remain on the surface, then insert it into the remote control and deactivate the anti-theft system. If this doesn't help, try turning it off using a spare key fob. If it works, the key fob is faulty; if not, the problem is somewhere inside the car.