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 DIAGNOSIS (SINGLE PAGE)ELECTRICALBODY ELECTRICALELECTRICAL SYSTEM - TESTING & TROUBLESHOOTING
2020 Honda Civic Si, 4D Sedan
Electrical System - Testing & Troubleshooting
2020 Honda Civic Si, 4D SedanSECTION Electrical System - Testing & Troubleshooting
- Symptom Troubleshooting Index
- Component Location Index
- Relay and Control Unit Locations
- Connector View
- Wireless Charger Connector for Inputs and Outputs (2/4-door)
- Wireless Charger Connector for Inputs and Outputs (5-door) (2017 2018 2019 2020 2021)
- Connector End View (C118) (Male)
- Connector End View (C118) (Female)
- Connector End View (C119) (Male)
- Connector End View (C119) (Female)
- Connector End View (C206) (Male)
- Connector End View (C206) (Female)
- Turbocharger 5P Connector (Female)
- Relay Circuit Board Connector A (8P) (Female)
- Relay Circuit Board Connector B (6P) (Female)
- Relay Circuit Board Connector C (18P) (Female)
- Under-Dash Fuse/Relay Box Connector C (27P) (Female)
- Connector and Harness Locations
- Input Test
- Fuse Relay Box Connector Locations
- Fuse to Components Index
- Check
- Test
- Symptom Troubleshooting
- 12 Volt Battery Symptom Troubleshooting - Low or dead 12 volt battery
- Wireless Charger Symptom Troubleshooting - Wireless charger indicators do not come on (green and amber) (2/4-door)
- Wireless Charger Symptom Troubleshooting - Wireless charger indicators do not come on (green and amber) (5-door) (2017 2018 2019 2020 2021)
- Description & Operation
- Ground to Components Index
- Symptom Troubleshooting Index for Viewer
- Wireless charger indicator blinks (amber) (2/4-door)
- Wireless charger indicator blinks (amber) (5-door) (2017 2018 2019 2020 2021)
- Wireless charger indicators blink (green and amber) (2/4-door)
- Wireless charger indicators blink (green and amber) (5-door) (2017 2018 2019 2020 2021)
- Wireless charger indicators do not come on (green and amber) (2/4-door)
- Wireless charger indicators do not come on (green and amber) (5-door) (2017 2018 2019 2020 2021)
- Circuit Diagram
- Accessory Power Sockets Circuit Diagram (2/4-door with Keyless Access System)
- Accessory Power Sockets Circuit Diagram (2/4-door without Keyless Access System)
- Accessory Power Sockets Circuit Diagram (5-door with Keyless Access System) (2017 2018 2019 2020 2021)
- Accessory Power Sockets Circuit Diagram (5-door without Keyless Access System) (2017 2018 2019 2020 2021)
- Ignition Switch Circuit Diagram
- Ignition Switch Circuit Diagram (5-door) (2017 2018 2019 2020 2021)
- Wireless Charger Circuit Diagram (2/4-door)
- Wireless Charger Circuit Diagram (5-door) (2017 2018 2019 2020 2021)
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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.