The immobilizer is an electronic unit that does not allow starting the engine without using the ignition key or with the help of an outside key.
An electronic code key is integrated into the head of the ignition key.
When trying to start the engine without using an ignition key with a built-in code key, the immobilizer, without receiving information about the key code, sends a special code command to the electronic engine control unit (controller) that prohibits starting the engine.
The immobilizer has protection against key selection, as well as protection against reading the code transmitted via the code line to the controller.
The immobilizer switches to armed mode automatically when the ignition is turned off.
Also, the immobilizer automatically disarms when the ignition is turned on without any additional actions by the driver.
When starting the engine at the moment the ignition is turned on, the immobilizer reads the code of the electronic coded key built into the head of the ignition key.
If the read code matches the code stored in the immobilizer's memory, the immobilizer will disarm.
After that, the controller requests information from the immobilizer about the current security status.
If the controller receives a response from the immobilizer that the protection is disarmed, it issues a confirmation that the engine will be allowed to start.
Otherwise, the controller will not issue a confirmation that the engine can be started and will not allow the operation of the ignition and fuel injection systems.
To remove the immobilizer unit, disconnect the negative battery terminal
Remove the instrument panel
The immobilizer control unit is mounted on the steering column bracket
We press the latch and disconnect the block from the immobilizer control unit (shown on the removed steering column)
Unscrew the mounting bolt
Remove the immobilizer control unit from the steering column bracket
If you need to replace the immobilizer control unit, then you need to replace the ignition keys and the ignition lock cylinder
After installing a new unit, it needs to be reprogrammed
Install the immobilizer control unit in reverse order.
