Climate Control Unit Power, Ground, and Communication Circuit Troubleshooting
- Check the No. 36 (10A) 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 (10A) fuse circuit. ■
- Turn the ignition switch to ON (II).
- Measure the voltage between climate control unit connector A (36P) terminal No. 19 and body ground.
Is there battery voltage?
YES - Go to step 4.
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. ■
- Measure the voltage between climate control unit connector A (36P) terminal No. 4 and body ground.
Is there less than 0.5 V?
YES - Go to step 5.
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 G403. ■
- Turn the ignition switch to LOCK (0).
- Disconnect climate control unit connector A (36P).
- Check for continuity between the following terminals of the gauge control module 32P connector and climate control unit connector A (36P).
36P: 32P:
No. 35: No. 20
No. 36: No. 19
Is there continuity?
YES - Check for loose wires or poor connections at climate control unit connector A (36P). If the connections are good, substitute a known-good climate control unit, and recheck. ■
NO - Repair open in the wire between the Climate control unit and the gauge control module. ■