Control Assembly: Testing and Inspection
Climate Control Power and Ground Circuit Troubleshooting1. Check the No. 30 (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES - Go to step 2.
NO - Replace the fuse, and recheck.
2. Disconnect climate control unit connector A (20P).
3. Turn the ignition switch ON (II).
4. Measure the voltage between the No. 1 terminal of climate control unit connector A (20P) and body ground.
Is there battery voltage?
YES - Go to step 5.
NO - Repair open in the wire between the No. 30 (7.5 A) fuse in the under-dash fuse/relay box and the climate control unit.
5. Turn the ignition switch OFF.
6. Check for continuity between the No. 3 (Canada) or No. 6 (USA) terminal of climate control unit connector A (20P) and body ground.
Is there continuity?
YES - Check for loose wires or poor connections at climate control unit connector A (20P). 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 wires between the climate control unit and body ground. If the wire is OK, check for poor ground at G503 and/or G601.