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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 116 (IMMOBILIZER SYSTEM)SYSTEM DESCRIPTION
2002 Honda Civic Si

System Description

2002 Honda Civic SiSECTION System Description
WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

The vehicle is equipped with an immobilizer system (type ill) 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 light, and the PCM.

When a programmed 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 through the immobilizer control unit-receiver to the PCM, and the PCM enables the fuel and ignition systems. The transponder codes are embedded in the immobilizer control unit-receiver (fixed code). A handshake between the PCM and the immobilizer control unit-receiver is required at the PCM repair and replacement, and all keys are required at the immobilizer control unit-receiver repair and replacement.

Fig 1: Immobilizer Control Unit-Receiver System Description
G03642266Courtesy of AMERICAN HONDA MOTOR CO., INC.
  • If a programmed key has been used, the immobilizer indicator light 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 been set correctly, then the indicator will go off.
  • If the a non-programmed key has been used whose code was not received or recognized by the unit, the indicator light will come on for about 2 seconds, then it will blink until the ignition switch is turned OFF.
    Fig 2: Immobilizer Indicator Blinking Pattern
    G03642267Courtesy of AMERICAN HONDA MOTOR CO., INC.
RENDER: 1.0x

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