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 & TROUBLESHOOTING
2020 Honda Civic Si, 4D Sedan
Security System / Keyless Entry System - Testing & Troubleshooting
2020 Honda Civic Si, 4D SedanSECTION Security System / Keyless Entry System - Testing & Troubleshooting
- Symptom Troubleshooting Index
- Immobilizer System Symptom Troubleshooting Index
- Keyless Access System Symptom Troubleshooting Index
- Keyless/Power Door Locks/Security System Symptom Troubleshooting Index (2-door) (2016 2017 2018 2019 2020)
- Keyless/Power Door Locks/Security System Symptom Troubleshooting Index (4-door)
- Keyless/Power Door Locks/Security System Symptom Troubleshooting Index (5-door) (2017 2018 2019 2020 2021)
- Component Location Index
- HomeLink Remote Control System Component Location Index
- Immobilizer System Component Location Index (2/4-door)
- Keyless Access System Component Location Index (Except K20C1 (M/T))
- Keyless Access System Component Location Index (L15B7/L15BA (CVT))
- Keyless/Power Door Locks/Security System Component Location Index (2-door)
- Keyless/Power Door Locks/Security System Component Location Index (4-door)
- Keyless/Power Door Locks/Security System Component Location Index (4/5-door)
- Connector View
- Input Test
- Immobilizer-Keyless Control Unit Input Test (2/4-door)
- Immobilizer-Keyless Control Unit Input Test (5-door) (2017 2018 2019 2020 2021)
- Keyless Access System (Body Control Module and Electric Steering Lock) Input Test (2/4-door)
- Keyless Access System (Body Control Module and Electric Steering Lock) Input Test (5-door) (2017 2018 2019 2020 2021)
- Keyless/Power Door Locks/Security System (Body Control Module, Door Multiplex Control Unit, and Front Passenger's Power Window Switch) Input Test (2-door) (2016 2017 2018 2019 2020)
- Keyless/Power Door Locks/Security System (Body Control Module, Door Multiplex Control Unit, and Front Passenger's Power Window Switch) Input Test (4-door)
- Keyless/Power Door Locks/Security System (Body Control Module, Door Multiplex Control Unit, and Front Passenger's Power Window Switch) Input Test (5-door) (2017 2018 2019 2020 2021)
- Check
- General Information
- Immobilizer System Symptom Troubleshooting Information (2/4-door)
- Immobilizer System Symptom Troubleshooting Information (5-door) (2017 2018 2019 2020 2021)
- Keyless Access System Symptom Troubleshooting Information (2/4-door)
- Keyless Access System Symptom Troubleshooting Information (5-door) (2017 2018 2019 2020 2021)
- Keyless/Power Door Locks/Security System Tripped Sensor Recall
- Test
- Door Key Cylinder Switch Test (2-door) (2016 2017 2018 2019 2020)
- Door Key Cylinder Switch Test (4/5-door)
- Door Lock Actuator Test (2-door) (2016 2017 2018 2019 2020)
- Door Lock Actuator Test (4/5-door)
- Door Lock Knob Switch Test (2-door) (2016 2017 2018 2019 2020)
- Door Lock Knob Switch Test (4/5-door)
- Engine Start/Stop Switch Test
- Hood Latch Switch Test
- Immobilizer System Status Log
- Keyless Access LF Antenna Function Test
- Keyless Access LF Antenna Function Test (5-door) (2017 2018 2019 2020 2021)
- Keyless Access System Status Log
- Park Pin Switch Test
- Tailgate Outer Handle Switch Test (5-door) (2017 2018 2019 2020 2021)
- Trunk Lid Outer Handle Switch Test
- Symptom Troubleshooting
- Immobilizer System Symptom Troubleshooting - Engine does not start with the immobilizer key
- Immobilizer System Symptom Troubleshooting - Security indicator blinks (2/4-door)
- Immobilizer System Symptom Troubleshooting - Security indicator blinks (5-door) (2017 2018 2019 2020 2021)
- Immobilizer System Symptom Troubleshooting - Security indicator turns on
- Keyless Access System Symptom Troubleshooting - All the doors will not lock and unlock
- Keyless Access System Symptom Troubleshooting - Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch(2/4-door with Electric Steering Lock)
- Keyless Access System Symptom Troubleshooting - Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch (5-door with Electric Steering Lock) (2017 2018 2019 2020 2021)
- Keyless Access System Symptom Troubleshooting - Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch Without Electric Steering Lock
- Keyless Access System Symptom Troubleshooting - Cannot select ON mode with keyless access, but can select ON mode with the keyless remote touching the engine start/stop switch
- Keyless Access System Symptom Troubleshooting - Security indicator blinks
- Keyless Access System Symptom Troubleshooting - 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
- Keyless Access System Symptom Troubleshooting - The doors will not unlock or lock with the keyless remote, but will unlock or lock with the door outer handles
- Keyless Access System Symptom Troubleshooting - The engine starts but stalls immediately
- Keyless/Power Door Locks/Security System Symptom Troubleshooting - AUTO DOOR UNLOCK does not work (2-door) (2016 2017 2018 2019 2020)
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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.