Climate Control Communication Line Circuit Troubleshooting

Climate Control Communication Line Circuit Troubleshooting

1. Disconnect the front 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 front climate control unit 30P connector terminal No. 23 and climate control panel 5P connector terminal No. 2.





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.�

6. Check for continuity between front climate control unit 30P connector terminal No. 23 and rear control panel 5P connector terminal No. 2.





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.�

7. Check for continuity between front climate control unit 30P connector terminal No. 23 and rear climate control unit 22P connector terminal No. 17.





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.�

8. Check for continuity between front climate control unit 30P connector terminal No. 23 and body ground.





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.�