System Description

The vehicle is equipped with an immobilizer system (Type III) 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 ECM/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 ECM/PCM (fixed code embedded in receiver, handshake required at ECM/PCM repair and replacement, all keys required at control unit-receiver repair and replacement). The ECM/PCM then energizes the fuel supply system.

Fig 1: Immobilizer System Diagram

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. The engine will crank but not start.
• 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 his key, and cannot start the engine, contact Honda Customer Relations.

  IMMOBILIZER INDICATOR BLINKING PATTERN: 

  Fig 2: Immobilizer Indicator Blinking Pattern

  Courtesy of AMERICAN HONDA MOTOR CO., INC.