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.
Climate Control Communication Circuit Troubleshooting
- Disconnect the front climate control unit 30P connector.
- Disconnect the climate control panel 5P connector.
- Disconnect the rear climate control unit 22P connector.
- Disconnect the rear control panel 5P connector.
- Check for continuity between the No. 23 terminal of the front climate control unit 30P connector and the No. 2 terminal of the climate control panel 5P connector.Fig 1: Identifying Continuity Between No. 23 Terminal Of Front Climate Control Unit 30P Connector And No. 2 Terminal Of Climate Control Panel 5P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES - Go to step 6.
NO - Repair an open in the wire between the front climate control unit 30P connector and the climate control panel 5P connector.
- Check for continuity between the No. 23 terminal of the front climate control unit 30P connector and the Nonterminal of the rear control panel 5P connector.Fig 2: Identifying Continuity Between No. 23 Terminal And No. 2 Terminal Of Rear Control Panel 5P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES - Go to step 7.
NO - Repair an open in the wire between the front climate control unit 30P connector and the rear control panel 5P connector.
- Check for continuity between the No. 23 terminal of the front climate control unit 30P connector and the No. 17 terminal of the rear climate control unit 22P connector.Fig 3: Identifying Continuity Between No. 23 Terminal Of And No. 17 Terminal Of Rear Climate Control Unit 22P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES - Go to step 8.
NO - Repair an open in the wire between the front climate control unit 30P connector and the rear climate control unit 22P connector.
- Check for continuity between the No. 23 terminal of the front climate control unit 30P connector and body ground.Fig 4: Identifying Continuity Between No. 23 Terminal Of Front Climate Control Unit 30P Connector And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES - Repair a short to body ground in the wire between the front climate control unit, climate control panel, rear climate control unit and the rear control panel.
NO - Substitute a known-good rear control panel, climate control panel, front climate control unit, and rear climate control unit one at a time, rechecking the system after each substitution. Replace the unit that eliminates the symptom/indication.
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.