Antitheft and Alarm Systems: Description and Operation

System Description







The vehicle is equipped with a type IV immobilizer system that will disable the vehicle unless the programmed ignition key is used.
This system consists of a transponder located in the ignition key, an immobilizer control unit-receiver, an indicator light, and the PCM.

When the key is inserted in the ignition switch and turned to the ON (II) position, the immobilizer control unit-receiver sends power to the transponder in the ignition key. The transponder then sends a coded signal back to the immobilizer control unit-receiver which then sends a coded signal to the PCM. The system uses a rolling code embedded in the immobilizer control unit-receiver. A handshake between the PCM and the immobilizer control unit-receiver is required if the PCM is replaced, and all keys are required if the control unit-receiver is replaced.
- If the programmed key has been used, the immobilizer indicator light will come on for about 2 seconds, then go off. When the ignition switch is turned OFF,the indicator will blink for about 5 seconds to signal that the unit has reset correctly, then the indicator will go off.
- If the wrong key has been used or the code was not received or recognized by the unit, the indicator light will come on for about 2 seconds, then it will blink until the ignition switch is turned OFF.