Climate Control Power and Ground Circuit Troubleshooting

Climate Control Power and Ground Circuit Troubleshooting

1. Check the No. 36 (10 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?
YES - Go to step 2.

NO - Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. 36 (10 A) fuse circuit.


2. Disconnect climate control unit connector B (16P).

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

4. Measure the voltage between climate control unit connector B (16P) No. 16 terminal and body ground.

Is there battery voltage?
YES - Go to step 5.

NO - Repair open in the wire between the No. 36 (10 A) fuse in the under-dash fuse/relay box and the climate control unit.






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

6. Check for continuity between climate control unit connector A (24P) No. 24 terminal and body ground.

Is there continuity?
YES - Check for loose wires and poor connections at climate control unit connector A (24P). If 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 G571. A/C Wire Harness Connector and Harness Locations