System Description

The vehicle is equipped with a type IV 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 control unit-receiver, an indicator, 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 code is a rolling type embedded in the immobilizer control unit-receiver instead of the PCM.

Fig 1: Immobilizer System Description

Courtesy of AMERICAN HONDA MOTOR CO., INC.

• If the proper key has been used, the immobilizer indicator will come on for about 2 seconds, then go off.
• If the wrong key has been used or the code was not received or recognized by the unit, the indicator will come on for about 2 seconds, then it will blink until the ignition switch is turned OFF.
• If 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 customer has lost their key, and cannot start the engine, contact Honda Customer Relations.

Fig 2: Immobilizer Indicator Blinking Pattern

Courtesy of AMERICAN HONDA MOTOR CO., INC.