Immobilizer System

Immobilizer System Description








The vehicle is equipped with an immobilizer system that will disable the vehicle unless the proper ignition key is used. The immobilizer system is designed to prevent the car from being started without the owner's ignition key. If an attempt is made to start the car without the correct key, the immobilizer system will disable the car's fuel supply.

The immobilizer system consists of a transponder located in the ignition key, immobilizer receiver unit, immobilizer indicator light, PGM-FI main relay, fuel pump, and the PCM or ECM.

The vehicle has two kinds of keys:

a. The black master key for:
- ignition switch.
- door locks.
- trunk/hatch lock.
- glove box.

b. The gray valet key for:
- ignition switch.
- door locks.

When the key is inserted in the ignition switch and turned to the (II) position, the immobilizer receiver unit sends power to the transponder in the ignition key. The transponder then sends a coded signal back through the immobilizer receiver unit to the ECM/PCM.

- The immobilizer system can store up to six key codes.
- If it is necessary to rewrite the ECM/PCM to learn a new key, the dealer needs the customer's vehicle, all its master keys and valet keys, and the Honda PGM Tester equipped with an immobilizer program card. Any key that is not learned during rewriting will no longer start the engine.
- If the customer has lost his key, and cannot start the engine, contact Honda Customer Relations.

The vehicle is equipped with an immobilizer system that will disable the vehicle unless the proper ignition key is used.

This system consists of a transponder located in the ignition key, an immobilizer receiver unit, an indicator light, and the ECM/PCM.

When the key is inserted in the ignition switch and turned to the (II) position, the immobilizer receiver unit sends power to the transponder in the ignition key. The transponder then sends a coded signal back through the immobilizer receiver unit to the ECM/PCM.

- The immobilizer system can store up to six key codes.
- If it is necessary to rewrite the ECM/PCM to learn a new key, the dealer needs the customer's vehicle, all its master keys and valet keys, and the Honda PGM Tester equipped with an immobilizer program card. Any key that is not learned during rewriting will no longer start the engine.
- If the customer has lost his key, and cannot start the engine, contact Honda Customer Relations.

How the Circuit Works

With the ignition switch in ON (II) or START (III), the immobilizer receiver unit and the PCM or ECM receive an "ignition on" signal through fuse 44 and the PGM-FI main relay. The PCM or ECM then sends power to the ignition key transponder through the immobilizer receiver unit. The transponder then sends a coded signal back to the PCM or ECM through the receiver unit. If the signal is correct, the PCM or ECM will energize the car's fuel supply system by grounding the PGM-FI main relay. The immobilizer indicator light flashes a code to indicate that the correct key has been inserted. If the ignition key signal is not correct, the PCM or ECM will not energize the car's fuel supply system by not grounding the PGM-FI main relay. The immobilizer indicator light then flashes a code to indicate that an incorrect key has been inserted.