Climate Control Power and Ground Circuits Troubleshooting

1.Check the No. 14 (10A) fuse in the under-dash fuse/relay box.

Is the fuse OK?


YES - Go to 2.


NO - Replace the fuse, and recheck.n


2.Disconnect the climate control unit 30P connector.

3.Turn the ignition switch ON (II).

4.Measure the voltage between the No. 15 terminal of the climate control unit 30P connector and body ground.

 

Is there battery voltage?


YES - Go to 5.


NO - Repair open in the wire between the No. 14 fuse in the under-dash fuse/relay box and the  climate control unit.n


5.Turn the ignition switch OFF.

6.Check for continuity between the No. 1 terminal of the climate control unit 30P connector and body ground.

 

Is there continuity?


YES - Check for loose wires or poor connections at the climate control unit 30P connector. 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.n


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  G501.n