Immobilizer System

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, a receiver, a control unit, an indicator light, and the ECM.




The vehicle has three kinds of keys.

* The master key is for:
- ignition switch.
- door locks.
- trunk lock.

* The valet key is for:
- ignition switch.
- door locks.

* The learning key is for rewriting the immobilizer system.

NOTE: This key cannot start the engine; do not use it except for rewriting the system. If someone tries to start the engine with the learning key, all master and valet keys must be relearned.






When the key is inserted in the ignition and turned to the (II) position, the immobilizer control unit sends power to the transponder through the receiver.
The transponder then sends a coded signal back through the receiver to the control unit.
The control unit in turn signals the ECM, as well as the starter cut relay.

* If the proper key has been used, the starter cut relay will be energized, and the ECM will energize the fuel supply system. The immobilizer indicator light in the gauge assembly will simultaneously come on for about two seconds, then go off, thereby signaling that the immobilizer unit has recognized the code sent by the transponder.
^ If the wrong key has been used and the code was not received or recognized by the unit, the indicator light will come on for about two seconds, then it will continue blinking until the ignition switch is turned OFF.
* If the ignition switch is turned OFF, the indicator will blink for about five seconds to signal that the unit has been set correctly, then the indicator will go off.




IMMOBILIZER INDICATOR LIGHT BLINKING PATTERN:




Problems and Replacement Parts:
Parts Set:
A: Blank key
B: Immobilizer control unit
Master key
Learning key
C: Immobilizer receiver
D: Ignition switch with immobilizer receiver
Immobilizer control unit
Master key
Learning key
E: ECM
F: Door key cylinder
Master keys for doors open or locked
G: Ignition switch with immobilizer receiver
Immobilizer control unit
Master key
Learning key
Door key cylinders
Trunk key cylinder

NOTE:
- The immobilizer system can store up to five key codes.
- If it is necessary to rewrite the immobilizer control unit to learn a new key, the dealer needs the customer's vehicle, all its master keys and valet keys, its learning key, 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.

Before Testing:
* Due to the action of the immobilizer system, the engine takes slightly more time to start than engines of vehicle without an immobilizer system.
* When the system is normal, and the proper key is inserted, the indicator light comes on for two seconds, then it will go off.
* If the indicator starts to blink after two seconds, or if the engine does not start, repeat the starting procedure.
- If the engine still does not start, perform the immobilizer control unit input test and transponder and immobilizer receiver test.

* If all the input tests and transponder and immobilizer receiver test prove OK, check the ECM.
- If the ECM is OK, the immobilizer control unit must be faulty; replace the immobilizer control unit, master key and learning key together, and then rewrite the ECM with the Honda PGM Tester.
- If the ECM is faulty, substitute a known-good ECM, and recheck. However, since the known-good ECM has a different code stored into it, it must be rewritten with the Honda PGM Tester. Otherwise, the engine will not start.