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Circuit Description
Immobilizer SystemHow the Circuit Works
The immobilizer system is designed to prevent the vehicle from being started without the owner's ignition key. If an attempt is made to start the vehicle with any other key, the immobilizer system disables it from starting.
Fuse 23 (in the under-hood fuse/relay box) supplies battery voltage at all times to the Immobilizer Control Unit-Receiver and to gauge control module. With the ignition switch in ON (II) or START (III), fuse 2 (in the under-dash fuse/relay box) supplies voltage to the Immobilizer Control Unit-Receiver and the PCM.
If the proper ignition key is used, the Immobilizer Control Unit-Receiver sends a coded signal to the PCM and illuminates the immobilizer system indicator LED for 2 seconds. The coded signal informs the PCM that the proper ignition key is being used. The PCM grounds the PGM-FI Main Relay 1, energizing it to provide power to the fuel pump relay.
Following the first 2 seconds after the ignition switch is turned to ON (II) with the proper ignition key, the immobilizer system indicator LED turns off, and the engine will run under normal operating conditions.
Normal operation
- When the ignition switch is turned ON (II) and a programmed immobilizer code is identified, the immobilizer indicator illuminates for 2 seconds and then goes out.
- The immobilizer system will allow the vehicle to start normally.
- When the ignition switch is turned OFF (0), the immobilizer indicator does not light.
(Please note, this is different from previous systems.)
Immobilizer system detects a problem
- When the ignition switch is turned ON (II) and a programmed immobilizer code is not identified, the immobilizer indicator illuminates for 2 seconds and then blinks continuously.
- The immobilizer system results will vary depending on how quickly the key is turned. If the key is turned quickly from the OFF (0) position to the START (II) position, the vehicle will start and run for approximately 1 second and shut off. If the key is turned to the ON (II) position, delayed there, and then turned to the START (III) position, the starter will turn the motor over, but it will not start.
- When the ignition switch is turned OFF (0), the immobilizer indicator blinks ten times.
(Please note, this is different from previous systems.)