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.
Keyless Access System Symptom Troubleshooting Index
2020 Honda Civic Si, 4D SedanSECTION Keyless Access System Symptom Troubleshooting Index
| Symptom | Diagnostic procedure | Also check for |
|---|---|---|
| Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch |
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| Cannot select ON mode with keyless access, but can select ON mode with the keyless remote touching the engine start/stop switch | Symptom troubleshooting |
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| Cannot select ON mode with the keyless remote touching the engine start/stop switch, but can select ON mode with keyless access | Check the body control module |
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| The mode changes between ACCESSORY and ON, but it does not change to OFF |
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| The mode changes between ACCESSORY and ON, but it is difficult to change to OFF |
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| Symptom | Diagnostic procedure | Also check for |
|---|---|---|
| Engine start/stop switch does not work | Check for DTCs. If any DTC is indicated, go to the DTC troubleshooting |
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| Engine does not crank (power supply is normal) |
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| The engine starts, but stalls immediately | Symptom troubleshooting |
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| Security indicator blinks | Symptom troubleshooting |
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| All the doors will not lock and unlock | Symptom troubleshooting |
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| The doors will not unlock or lock with the keyless remote, but will unlock or lock with the door outer handles | Symptom troubleshooting |
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| The doors will not unlock or lock with the door outer handle touch sensor or lock switch, but will unlock or lock with the keyless remote | Symptom troubleshooting |
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*1: CVT
*2: With electric steering lock
RENDER: 1.0x
NO RELATED
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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.