Climate Control Unit Power and Ground Circuit Troubleshooting

Climate Control Unit Power and Ground Circuit Troubleshooting

1. Check the No. 30 (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. 30 (10 A) fuse circuit.

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

3. Measure the voltage between climate control unit connector A (40P) terminal No. 3 and body ground.





Is there battery voltage?

YES -

Go to step 4.

NO -

Repair an open in the wire between the No. 30 (10 A) fuse in the under-dash fuse/relay box and the climate control unit.

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

5. Check for continuity between climate control unit connector A (40P) terminal No. 37 and body ground.





Is there continuity?

YES -

Check for loose wires or poor connections at climate control unit connector A (40P). If the connections are good, substitute a known-good climate control unit, and recheck.

NO -

Check for an open in the wire between the climate control unit and body ground. If the wire is OK, check for poor body ground at G506.