Climate Control Power and Ground Circuit Troubleshooting

Climate Control Power and Ground Circuit Troubleshooting

1. Check the No. 16 (7.5 A) fuse in the driver's 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. 16 (7.5 A) fuse circuit.


2. Disconnect climate control unit connector A (28P).

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

4. Measure the voltage between climate control unit connector A (28P) terminal No. 9 and body ground.

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

NO - Repair an open in the wire between the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box and the climate control unit.






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

6. Disconnect climate control unit connector B (12P).

7. Check for continuity between climate control unit connector B (12P) terminal No. 3 and body ground.

Is there continuity?
YES - Check for loose wires or poor connections at climate control unit connector B (12P). 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 ground at G401, with navigation, without navigation.