Lada Priora cars are equipped with an immobilizer, which is an electronic system designed to prevent unauthorized engine starting by breaking the electrical circuits of the engine control system.
The immobilizer is built into the glass unit control unit.
The system consists of a control unit, a control lamp in the instrument cluster, a communication coil in the ignition switch, a working key in the remote control and a training key with a red mark.
The immobilizer operating modes are displayed by turning on the indicator and by signals from the buzzer built into it.
The immobilizer control unit and the engine ECU can be in one of two states:
- State 1 — the immobilization function is disabled. In this state, the immobilizer control unit is switched off, there is no connection between it and the ECU, engine blocking is impossible;
- State 2 — the immobilizer function is enabled (trained state).
In this state, the engine can be blocked, unlocking is performed by the ECU receiving the correct password from the immobilizer control unit.
The ECU and immobilizer enter the trained state after training the working keys using the training key.
Once the training procedure is complete, both units enter the trained state.
In order not to lose the training key (with a red insert), use only working keys to start the engine.
Training immobilizer keys
To activate the anti-theft function, perform the immobilizer training procedure.
After the entire training procedure has been completed:
- – the engine management system ECU will have the anti-theft function is activated, if it has not been activated yet;
- – the system will change its password to a new one, selected randomly;
- – a new system password will be written to the training key;
- – information about all previously trained working keys will be erased from memory;
- – the codes of those working keys that were trained in this training procedure will be entered into memory.
The immobilizer training procedure is used in the following cases:
- – to activate the anti-theft function in the ECU (for example, on a new car or when replacing a faulty ECU);
- – if working keys are lost, to erase information about old working keys and to train new ones;
- – to change the system password if the owner assumes that the password could have been read (for example, when selling a car from one owner to another);
- – when replacing the faulty immobilizer with a new one to teach working keys.
The system is designed to teach only two working keys. You can teach only new working keys (i.e. those that have not been taught by another immobilizer) or those that have previously been taught using the teaching key used in this teaching procedure.
You can teach working keys only together with an ECU in which the anti-theft function is not activated, or with an ECU that has been taught together with the teaching key used in this teaching procedure.
To teach an immobilizer key, do the following.
- 1. Close all vehicle doors. Turn on the ignition with the teaching key and wait at least 6 s.
- 2. Turn off the ignition. The indicator lamp should start flashing at an increased rate (5 times per second) all the time while the learning procedure is being performed correctly.
When the lamp stops flashing quickly, it means that an incorrect operation has been performed, the time allocated for the learning procedure has been exceeded, or there is a malfunction.
Remove the learning key from the ignition switch.
- 3. While the indicator lamp is flashing (about 6 seconds), insert the working key into the switch and turn on the ignition. If everything is done correctly, the buzzer will beep three times when the ignition is turned on.
- 4. Wait with the ignition on (about 6 s) until the buzzer beeps twice more.
If there are no beeps after 6 s and the indicator lamp stops flashing quickly, turn off the ignition and start the procedure again.
If the learning procedure still fails, there is a malfunction or this working key has already been taught by another immobilizer.
- 5. Turn off the ignition.
If it is necessary to teach a second working key, repeat steps 3–5, turning on the ignition with the second learning working key.
If this is not necessary, continue the learning procedure.
- 6. While the indicator lamp is flashing (about 6 s), remove the learned working key from the ignition switch, reinsert the learning key into the switch and turn on the ignition. If everything is done correctly, the buzzer will give three signals when the ignition is turned on.
- 7. Wait with the ignition on (about 6 sec) until the buzzer gives two more beeps.
- 8. Switch off the ignition, but do not remove the learning key from the ignition switch. About 6 seconds after switching off the ignition, the buzzer should sound once, and the indicator lamp should start flashing at double the frequency.
If the buzzer does not sound and the indicator lamp stops flashing quickly, then you must switch off the ignition and start the learning procedure again.
If you still cannot complete the learning procedure, then a malfunction has occurred or this learning key is not suitable for this ECU.
- 9. No later than 6 seconds after the sound signal (while the lamp is flashing quickly), turn on the ignition with the same training key.
After waiting 2-3 seconds, turn off the ignition.
No later than 5 seconds after turning off the ignition, the buzzer should beep three times and the indicator lamp should stop flashing quickly.
Do not turn on the ignition for at least another 10 seconds.
When working with some controllers, the lamp stops flashing and the buzzer beeps three times when the ignition is turned on.
In this case, you should still turn off the ignition and wait at least 10 seconds.
After completing the training procedure, it may be necessary to re-synchronize the immobilizer and ECU codes, since after completing the training procedure, the ECU may not allow the engine to be started when the ignition is first turned on.
To re-synchronize the codes, turn on ignition with any trained key (preferably a working one).
Pause for 6 sec.
If the immobilizer indicator lamp starts to indicate an erroneous system state (flashing once per second), turn off the ignition and wait at least 10 sec.
Then turn on the ignition again.
The lamp should not flash, and the engine should start running.
If the indicator lamp remains constantly lit 3 sec after turning on the ignition, the ECU anti-theft function is not activated and the training procedure should be repeated again.
Actions to take if immobilizer keys are lost
If a working key is lost, you must purchase a new key blank and cut it to work with the ignition switch (lock) installed on the vehicle.
Then you must perform the immobilizer training procedure using the existing training and new working keys.
If the training key is lost, the key training procedure cannot be performed.
This means that you can continue to operate the car only with the existing working key.
If the remaining working key is lost or if the immobilizer is faulty, both the immobilizer and the ECU will have to be replaced with new ones.
After such a replacement, you can cut a new training key blank to work with the ignition switch installed on the car, and perform the training procedure.
Additional functions of the immobilizer
Control of the delay in switching off the interior light
This function allows you to provide interior lighting for some time after the car doors are closed, which makes it easier for the driver to operate in the dark.
For this function to work, the light must be switched off using its switch key.
When the ignition is off and any door is opened, the light comes on and remains lit the entire time the door is open.
After the door is closed, the light remains on for another 12 seconds, after which it gradually goes out within 4 seconds.
If you open the door again while the light has not yet gone out completely, it will remain lit at full intensity the entire time the door is open.
If you turn the ignition key to the "on" position while the light has not gone out, the light will go out immediately.
When the ignition is on, opening the driver's door does not turn on the light; opening any other door turns the light on; closing it turns it off without delay.
Turning the rear fog light on and off
You can turn on the rear fog light by pressing its switch only if the headlights or fog lights are on.
If the rear the fog light is already on, you can turn it off by pressing the button again.
When you turn off the parking light, the rear fog light turns off automatically. Warning about the key left in the ignition.
If the ignition is off, but the key is left in the ignition, then when you open the driver's door, the buzzer gives a signal (trill).
Warning about the parking light left on.
If the ignition is off, but the parking light lamps are still on, then when you open the driver's door, the buzzer gives two signals.
