System Description

The vehicle is equipped with a type IV immobilizer system that will disable the vehicle unless a programmed ignition key is used.

This system consists of a transponder located in the ignition key, an immobilizer control unit-receiver, an indicator, imoes unit (Except '07 USA models), and the ECM/PCM.

When the immobilizer key is inserted into 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 sends a coded signal to the imoes unit, which confirms the code and signals the ECM/PCM to supply power to the fuel pump circuit.

A communication agreement with the HDS is required at the ECM/PCM or the imoes unit after repair or replacement. When replacing the immobilizer control unit-receiver, all keys are required to be registered into the new control unit-receiver. Any keys that were not registered in the control unit-receiver will not start the vehicle.

Fig 1: Immobilizer Control Unit-Receiver - Communication Diagram

Courtesy of AMERICAN HONDA MOTOR CO., INC.

• If the programmed key has been used, the immobilizer indicator will come on for about 2 seconds, then go off. When 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 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.

  IMMOBILIZER INDICATOR BLINKING PATTERN: 

  Fig 2: Immobilizer Indicator Blinking Pattern Chart

  Courtesy of AMERICAN HONDA MOTOR CO., INC.