Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 116 (IMMOBILIZER SYSTEM)SYSTEM CHECK
2002 Honda Civic Si
System Check
2002 Honda Civic SiSECTION System Check
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.
- Connect the HDS to the data link connector.
- Turn the ignition switch ON (II).
- Monitor the System Check in the Immobilizer Info with the HDS.
- If the HDS displays the "Immobilizer system is normal", the immobilizer system is OK. If the HDS displays any other messages, check as follows:SYSTEM CHECK
Status Log No. System Check Possible Failures A-1 Immobilizer system is not normal - This key is not registered in the immobilizer unit. Try to register keys by using "KEYS".
- The communication was not good between the antenna and the immobilizer key by influence of metal such as key chains.
- The communication was not good between the antenna and the immobilizer key by battery voltage low.
A-2 Immobilizer system is not normal - Intermittent interruption between transponder and immobilizer unit.
- The immobilizer key type is different. It is not for this vehicle but for another one or for other company's one.
- Key failure (transponder failure)
- The communication was not good between the antenna and the immobilizer key by influence of metal such as key chains.
- The communication was not good between the antenna and the immobilizer key by battery voltage low.
A-3 Immobilizer system is not normal - The ignition switch was turned on with a non-immobilizer key.
- The immobilizer key type is different. It is not for this vehicle but for another one or for other company's one.
- Key failure (transponder failure)
- The communication was not good between the antenna and the immobilizer key by influence of metal such as key chains.
- The communication was not good between the antenna and the immobilizer key by battery voltage low.
- Immobilizer unit failure
B-1 Immobilizer system is not normal - The PCM was not registered. Try to register the PCM by using "REPLACE PCM".
- The communication was not good between the PCM and the immobilizer unit by battery voltage low.
- The communication was not good between the immobilizer unit and the PCM by influence of some noise.
B-2 Immobilizer system is not normal - The PCM was not registered. Try to register the PCM by using "REPLACE PCM".
- The communication was not good between the PCM and the immobilizer unit by battery voltage low.
- The communication was not good between the immobilizer unit and the PCM by influence of some noise.
D-1 Immobilizer system is not normal - Harness short from the PCM to the immobilizer unit. (S-net line short)
- The communication was not good between the PCM and the immobilizer unit by battery voltage low.
- The communication was not good between the immobilizer unit and the PCM by influence of some noise.
- Immobilizer unit failure
- PCM failure
D-3 Immobilizer system is not normal - Blown fuse
- Harness open from the PCM to the immobilizer unit.
- The communication was not good between the PCM and the immobilizer unit by battery voltage low.
- The communication was not good between the immobilizer unit and the PCM by influence of some noise.
- Immobilizer unit failure
- PCM failure
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.