## Climate Control Power and Ground Circuit Troubleshooting

1. | Check the No. 10 (7.5A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES - Go to 2. NO - Replace the fuse, and recheck.n

2. | Disconnect climate control unit 28P connector.

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

4. | Measure the voltage between the No. 3 terminal of climate control unit 28P connector and body ground. Is there battery voltage? YES - Go to 5. NO - Repair open in the wire between the No. 10 fuse in the under-dash fuse/relay box and the climate control unit.n

5. | Turn the ignition switch OFF.

6. | Check for continuity between the No. 5 terminal of climate control unit 28P connector and body ground. Is there continuity? YES - Check for loose wires or poor connections at climate control unit 28P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.n NO - Check for an open in the wires between the climate control unit and body ground. If the wire is OK, check for poor ground at G402.n