Climate Control Communication Circuit
Climate Control Communication Circuit Troubleshooting1. Disconnect the climate control unit 30P connector.
2. Disconnect the climate control panel 5P connector.
3. Disconnect the rear climate control unit 22P connector.
4. Disconnect the rear control panel 5P connector.
5. Check for continuity between the No. 23 terminal of the climate control unit 30P connector and the No. 2 terminal of the climate control panel 5P connector.
Is there continuity?
YES - Go to step 6.
NO - Repair an open in the wire between the climate control unit 30P connector and the climate control panel 5P connector.
6. Check for continuity between the No. 23 terminal of the climate control unit 30P connector and the No. 2 terminal of the rear control panel 5P connector.
Is there continuity?
YES - Go to step 7.
NO - Repair an open in the wire between the climate control unit 30P connector and the rear control panel 5P connector.
7. Check for continuity between the No. 23 terminal of the climate control unit 30P connector and the No. 17 terminal of the rear climate control unit 22P connector.
Is there continuity?
YES - Go to step 8.
NO - Repair an open in the wire between the climate control unit 30P connector and the rear climate control unit 22P connector.
8. Check for continuity between the No. 23 terminal of the climate control unit 30P connector and body ground.
Is there continuity?
YES - Repair a short to body ground in the wire between the 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, 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.