System Description
SYSTEM DESCRIPTIONImmobilizer Indicator
The immobilizer indicator is on the instrument panel. When you insert a programmed ignition key (master or valet) into the ignition switch, and turn the switch to ON (II), the indicator flashes once and then goes off. At this point, the engine can be started by turning the ignition switch to START (III). Unlike previous systems, the indicator does not come on when you turn the ignition switch to LOCK (0).
If you insert a nonprogrammed ignition key into the ignition switch and turn the switch to ON (II), the indicator flashes once and then blinks continuously. The immobilizer system results vary, depending on how quickly you turn the key.
^ If the ignition switch is turned quickly from LOCK (0) to START (III), the engine will start and run for about 1 second, then shut off.
^ If the ignition switch is turned to ON (II), then you pause before turning to START (III), the starter will crank the engine, but the engine will not start.
When a nonprogrammed key is used and the ignition switch is returned to LOCK (0), the immobilizer indicator flashes 10 times to show that the system has reset.
Immobilizer-Keyless Control Unit
The immobilizer-keyless control unit is inside the bezel around the ignition switch. It uses electromagnetic induction to energize the transponder in the key. There is no direct electrical connection. Once the transponder is energized, the key sends its ID code to the immobilizer-keyless control unit which checks the code against the codes stored in its memory. If the ID code does not match, no serial code is sent, and the engine does not start.
Engine Control Module (ECM)/Powertrain Control Module (PCM)
The ECM/PCM is an integral part of the immobilizer system. When the ECM/PCM receives the unique serial code from the immobilizer-keyless control unit, it communicates or "handshakes" with the immobilizer-keyless control unit by sending back its own unique serial code. If the serial codes are mutually recognized, the ECM/PCM energizes the fuel supply system so the engine can start.