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 178 (KEYLESS/POWER DOOR LOCKS/SECURITY SYSTEM)SYMPTOM TROUBLESHOOTING
2002 Honda Civic Si
Symptom Troubleshooting
2002 Honda Civic SiSECTION Symptom Troubleshooting
WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
- Troubleshoot the keyless entry/security alarm system by the symptom index.SYMPTOM TROUBLESHOOTING
Symptom Location Possible cause The door will not lock or unlock. Door lock system - B-CAN troubleshooting test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A )
- Control unit input test
Transmitter - Transmitter test
- Transmitter programming
Wire harness Control unit input test Steering lock - Ignition switch test
- Ignition key switch testNOTE: If the key is in the ignition key switch or the ignition switch is ON (II), the door lock system does not function.
Keyless receiver Transmitter programming Door multiplex control unit Door multiplex control unit input test The door will not lock. Door switch Door switch test Door lock system - Door lock knob switch test
- Control unit input test
The door will not unlock. Door switch Door switch test Door lock system - Door lock knob switch test
- Control unit input test
Transmitter will not program. Transmitter Transmitter test Ignition switch Ignition switch test Wire harness Control unit input test Keyless receiver - B-CAN troubleshooting test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A )
- Power window master switch input test
Door lock system Control unit input test Door will relock even if the door is opened once after unlocking with remote. Door switch Door switch test Door will lock and unlock with the remote even if the ignition switch is ON (II). Steering lock - Ignition switch testNOTE: If the ignition switch is ON (II), the door lock system does not function.
Door will lock or unlock with the remote even if the key is in the ignition key switch. Steering lock - Ignition key switch testNOTE: If the key is in the ignition key switch, the door lock system does not function.
Sometimes door will not lock or unlock. Door switch Door key cylinder switch Tailgate latch switch - Door switch test
- Door key cylinder switch test
- Tailgate latch switch test
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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.