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 SPORT, 4D HATCHBACK, STANDARD TRANSREPAIR AND DIAGNOSISBODY & FRAMESEATSSEATS - TESTING & TROUBLESHOOTINGCONNECTOR VIEWFRONT SEAT HEATER CONTROL UNIT CONNECTOR FOR INPUTS AND OUTPUTS
2020 Honda Civic Sport, 4D Hatchback, Standard Trans
Front Seat Heater Control Unit Connector for Inputs and Outputs
2020 Honda Civic Sport, 4D Hatchback, Standard TransSECTION Front Seat Heater Control Unit Connector for Inputs and Outputs
| Terminal number | Terminal name | Description | Signal |
|---|---|---|---|
| 1 | +B HEATER(DR) | Outputs +B HEATER(DR) signal | With front seat heater operation: about battery voltage If none of above conditions are met: less than 0.2 V |
| 2 | HEATER ECU +B | Power source for front seat heater control unit | With vehicle in ON mode and front seat heater switch ON: about battery voltage |
| 3 | +B HEATER(AS) | Outputs +B HEATER(AS) signal | With front seat heater operation: about battery voltage If none of above conditions are met: less than 0.2 V |
| 4 | GND(HEATER and ECU) *1GND(HEATER and HEATER ECU) *2 | Ground for front seat heater control unit | Less than 0.2 V at all times |
| 5 | Not used | --- | --- |
| 6 | -THERMISTER(AS) *1AS TH- *2 | -THERMISTER(AS) signal *1AS TH- signal *2 | --- |
| 7 | -THERMISTER(DR) *1DR TH- *2 | -THERMISTER(DR) signal *1DR TH- signal *2 | --- |
| 8 | Not used | --- | --- |
| 9 | IG1 | IG1 power source | With vehicle in ON and START mode: about battery voltage |
| 10 | B-CAN_L | Communication line | --- |
| 11 | B-CAN_H | Communication line | --- |
| 12 | +THERMISTER(AS) *1AS TH+ *2 | +THERMISTER(AS) signal *1AS TH+ signal *2 | --- |
| 13 | +THERMISTER(DR) *1DR TH+ *2 | +THERMISTER(DR) signal *1DR TH+ signal *2 | --- |
| 14 | Not used | --- | --- |
*1: Without power seat
*2: With power seat
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.