Check the No. 14 (10A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES - Go to step 2. NO - Replace the fuse and recheck. Disconnect the climate control unit connector A (14P). Turn the ignition switch ON (II). Measure the voltage between the No. 14 terminal of the climate control unit connector A (14P) and body ground. CLIMATE CONTROL UNIT CONNECTOR A (14P) Wire side of female terminals Is there battery voltage? YES - Go to step 5. NO - Repair open in the wire between the No. 14 fuse in the under-dash fuse/relay box and the climate control unit. Turn the ignition switch OFF.

Check for continuity between the No. 13 terminal of climate control unit connector A (14P) and body ground. CLIMATE CONTROL UNIT CONNECTOR A (14P) Wire side of female terminals Is there continuity? YES - Check for loose wires or poor connections at climate control unit connector A (14P). 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. NO - Check for an open in the wire between the climate control unit and body ground. If the wire is OK, check for poor ground at G501 (5-door) or G502 (4-door).