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 heater control panel connector A (14P). Turn the ignition switch ON (II). Measure the voltage between the No. 14 terminal of heater control panel connector A (14P) and body ground. HEATER CONTROL PANEL 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 heater control panel. Turn the ignition switch OFF.

Check for continuity between the No. 13 terminal of heater control panel connector A (14P) and body ground. HEATER CONTROL PANEL CONNECTOR A (14P) Wire side of female terminals Is there continuity? YES - Check for loose wires or poor connections at heater control panel connector A (14P). If the connections are good, substitute a known-good heater control panel and recheck. If the symptom/indication goes away, replace the original heater control panel. NO - Check for an open in the wire between the heater control panel and body ground. If the wire is OK, check for poor ground at G501 (5-door) or G502 (4-door).