The composition of the immobilizer is shown in fig. 7-47. The immobilizer connection diagram is shown in fig. 7-48. The addresses of the output plugs of the APS-6 control unit are given in Table. 7-15.
The immobilizer consists of a control unit 1, a system status indicator 3, located in the control lamp unit 2 (in the instrument cluster on vehicles of configurations 55, 34), communication coil 5, structurally located in the ignition switch 4, working code key 6 with a black container 7, training code key 8 with a red container and the corresponding part of the engine management system controller program.
The APS operating modes and states are displayed using an annunciator and a buzzer inside the APS control unit.
Pic. 7-47. The composition of the immobilizer:
1 - control unit;
2 - block of control lamps (instrument cluster on vehicles of configuration 55);
3 - immobilizer signaling device;
4 - ignition switch;
5 - communication coil;
6 - working ignition key;
7 - container with transponder (black color - for working key, red color - for training key);
8 - learning ignition key.
The controller and control unit can be in one of two states:
- with disabled immobilization function («clean»). In this state, the controller and the APS control unit are not a single system, and engine start is allowed regardless of the APS;
- with immobilization function enabled («trained»). In this state, engine operation is possible only when the ECM receives the correct password from the APS control unit, issued when the corresponding code is read from the ignition key.
The controller and the APS control unit enter the trained state after the procedure for learning the working ignition keys, performed using the learning key, is completed. You can either train «clean» keys, i.e. those who have never studied before, or those who have already worked with this particular APS.
After the learning procedure is completed, the learning key with which it was performed becomes for this pair the controller - the APS control unit «their» and it is recommended to use it only for performing training procedures.
Attention. The learning key cannot be used to teach any other pair of APS control unit - ECM.
After learning, the working ignition key is used to remove the prohibition of starting the engine.
Attention. To ensure stable reading of the key code by the immobilizer, it is not allowed to mount two or more coded ignition keys on one ring.
Immobilizer training
1. Close all doors. Insert the learning key into the ignition switch. Turn on the ignition, after 6 seconds, the immobilizer indicator should light up with a constant light, indicating the unlearned state of the APS (if the APS has already been trained before, then the indicator will not light up).
2. Turn off the ignition. The indicator should flash at a frequency of 5 times per second.
3. Within 6 seconds after the start of flashing, remove the learning key and turn on the ignition with the working key. The buzzer of the APS control unit should give 3 beeps. If this did not happen, and the flashing stopped, then this means:
- the time interval of 6 seconds was exceeded - repeat the training procedure, starting from step 1;
- the working key has already been trained with another APS or it is faulty - replace the working key and repeat the learning procedure, starting from step 1.
4. After giving 3 beeps, wait 6 seconds until the APS control unit buzzer gives 2 more beeps and turn off the ignition.
5. Within 6 seconds, while the indicator continues to flash, remove the working key and turn on the ignition with the learning key. The buzzer should emit 3 beeps and 2 more beeps after 6 seconds.
6. Turn off the ignition without removing the learning key. The buzzer should give out a single sound signal and the signaling device should flash at a double frequency (10 times per second).
The time between the moment of turning off the ignition and the signaling device switching to the accelerated flashing mode should not exceed 15 seconds.
If the sound signal does not sound and the signaling device stops flashing, you should repeat the learning procedure again.
7. After the buzzer gives a single beep, no later than 10 seconds, turn on the ignition. The buzzer should give 3 beeps (additionally, on vehicles of configurations 55 and 34, equipped with a CDS with an electric package, the direction indicators should flash three times). After the buzzer gives three beeps, turn off the ignition.
Attention. When step 7 is performed, after the ignition is turned on, the process of storing the codes by the ECM controller and the APS control unit begins, therefore it is strictly forbidden to turn off the ignition until three beeps of the buzzer have sounded. For guaranteed completion of the code memorization process, the time between the moment the ignition is turned on and off must be at least 5 s. Failure to comply with the above conditions may result in an ECM lockout.
8. Remove the learning key. Wait with the ignition off for at least 10 seconds.
Check immobilizer operation. To do this, turn on the ignition with a working key, the immobilizer indicator should not flash or stay on. Carry out a test run of the engine. If the engine starts, then the learning procedure is completed, the system is working.
Attention! If for any reason the training procedure was interrupted after performing step 4, then it must be repeated and completed without changing the system components (ECM, immobilizer, code keys). If one of the components of the system, after an incomplete learning process on one vehicle, is trained on another vehicle with other components, then software failures in its operation are possible.
Pic. 7-48. Immobilizer connection diagram:
1 - ignition switch;
2 - immobilizer;
3 - block of control lamps (instrument cluster on vehicles of configuration 55);
4 - rear fog lights switch;
A - to power supplies;
B - to the controller, contact «71»;
C - to the diagnostic block;
D - to the driver's door sensor;
E - to the ceiling lamp;
F - to the outdoor lighting switch (turning on side lights);
G - to the fog lamps in the rear lights;
H - to the outdoor lighting switch (switching on low beam headlights);
J - to the fog lamp switch;
K - to the power window relay (terminal «85»).
Table 7-15. Addresses of the output plugs of the APS-6 control unit
Additional functions of the immobilizer
Rear fog light on/off control (ZPTO)
The activation of the RPTO occurs when the button of the RPTO switch is pressed, if the dipped headlights or fog lights were previously turned on.
The ZPTO is switched off by pressing the button of the ZPTO switch again.
The automatic shutdown of the BPHE occurs when the dipped beam headlights and fog lamps are turned off.
The light indicator, located on the switch key, will be on during the entire time of operation of the ZPTO.
Issuing a warning about the left key in the ignition switch
If the ignition is off, the buzzer will sound an intermittent beep when the driver's door is opened if the key is left in the ignition switch.
Issuing a warning about the side lights left on
If the ignition is turned off and the key is removed from the ignition switch, then when the driver's door is opened, the buzzer will emit two intermittent beeps if the parking lights are on.
Power window relay control
The power windows can be operated with the ignition on or for 30 seconds after the ignition is turned off if the driver's door has not been opened.
Management of a delay of switching off of a plafond of illumination of salon
This function allows you to keep the interior lighting for some time after the driver's door is closed (all doors in trim levels 55 and 34). The modes described below are implemented if the interior light switch is in the position «turned off».
The dome lights up when any door is opened, regardless of the position of the key in the ignition switch.
If the ignition is off, then after closing the driver's door with the other doors closed (the last door of the car in trim levels 55 and 34) The lamp stays on for 12 seconds and then goes out smoothly for 2 seconds.
If during the lamp off delay (doors closed, ignition key in position «turned off») turn the ignition key to position «included», then the ceiling light goes out smoothly for 2 seconds, starting from the moment the ignition is turned on.
A description of the diagnosis and repair of the immobilizer is given in the repair manual for the engine management system.