A/C Control Power And Ground Circuit Troubleshooting

A/C Control Power and Ground Circuit Troubleshooting

1. Check the No. 30 (10 A) fuse in the driver's under-dash fuse/relay box.

Is the fuse OK?

YES -

Go to step 2.

NO -

Replace the fuse, and recheck.�

2. Disconnect A/C control panel connector A (22P).

3. Turn the ignition switch to ON (II).

4. Measure the voltage between A/C control panel connector A (22P) terminal No. 11 and body ground.





Is there battery voltage?

YES -

Go to step 5.

NO -

Repair an open in the wire between the No. 30 (10 A) fuse in the driver's under-dash fuse/relay box and the A/C control panel.�

5. Turn the ignition switch to LOCK (0).

6. Check for continuity between A/C control panel connector A (22P) terminal No. 1 and body ground.





Is there continuity?

YES -

Go to step 7.

NO -

Check for an open in the wire between the A/C control panel and body ground. If the wire is OK, check for poor ground at G504.�

7. Disconnect the rear A/C control panel 5P connector.

8. Turn the ignition switch to ON (II).

9. Measure the voltage between rear A/C control panel 5P connector terminal No. 3 and body ground.





Is there battery voltage?

YES -

Go to step 10.

NO -

Repair an open in the wire between the No. 30 (10 A) fuse in the driver's under-dash fuse/relay box and the rear A/C control panel.�

10. Turn the ignition switch to LOCK (0).

11. Check for continuity between rear A/C control panel 5P connector terminal No. 1 and body ground.





Is there continuity?

YES -

Go to step 12.

NO -

Check for an open in the BLK wire between the rear A/C control panel and body ground. If the wire is OK, check for poor ground at G601.�

12. Disconnect A/C control panel connector B (14P).

13. Check for continuity between A/C control panel connector B (14P) terminal No. 4 and rear A/C control panel 5P connector terminal No. 2.





Is there continuity?

YES -

Go to step 14.

NO -

Repair an open in the wire between the A/C control panel and rear A/C control panel.�

14. Check for continuity between rear A/C control panel 5P connector terminal No. 2 and body ground.





Is there continuity?

YES -

Repair a short to body ground in the wire between the A/C control panel and the rear A/C control panel.�

NO -

Check for loose wires or poor connections at A/C control panel connectors A (22P), B (14P) and rear A/C control panel 5P connector. If the connections are good, substitute a known-good A/C control panel, and recheck. If the symptom/indication is still present, substitute a known-good A/C control panel, and recheck.�