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 MANUALSHONDA2020CIVIC SI, 4D SEDANREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSSECURITY SYSTEM / KEYLESS ENTRY SYSTEM - TESTING & TROUBLESHOOTINGSYMPTOM TROUBLESHOOTING INDEXKEYLESS/POWER DOOR LOCKS/SECURITY SYSTEM SYMPTOM TROUBLESHOOTING INDEX (4-DOOR)
2020 Honda Civic Si, 4D Sedan
Keyless/Power Door Locks/Security System Symptom Troubleshooting Index (4-door)
2020 Honda Civic Si, 4D SedanSECTION Keyless/Power Door Locks/Security System Symptom Troubleshooting Index (4-door)
NOTE: If the door lock system and the keyless operation do not work, troubleshoot the door locks first. The system does not function when turn the vehicle to the ON mode.
| Symptom | Check Items | Also check for |
|---|---|---|
| The security system sounds randomly while the doors are locked | Tripped sensor recall | |
| The horn does not sound and/or the headlights do not flash when the PANIC button on the keyless transmitter/remote is pressed | Symptom troubleshooting | |
| Security alarm system will not arm | Symptom troubleshooting | |
| All the doors will not lock or unlock with driver's door key cylinder or door lock switch or keyless transmitter/remote |
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| Driver's door will not lock or unlock |
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| Left rear door will not lock or unlock |
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| Front passenger's and right rear doors will not lock or unlock |
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| Passenger doors will not unlock with the remote or key cylinder switch, but will unlock with the inside door unlock switch | Driver's door lock knob switch test (check for door lock knob switch ON/OFF information with the HDS) | |
| Doors automatically relock 30 seconds after being unlocked with the remote even though a door has been opened | Symptom troubleshooting | |
| Auto door unlock does not work | Symptom troubleshooting |
*: L15BY engine
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.