Climate Control Power and Ground Circuit Troubleshooting
Climate Control Power and Ground Circuit Troubleshooting1. Check the No. 30 (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. 30 (7.5 A) fuse circuit.
2. Disconnect the climate control unit 40P connector.
3. Turn the ignition switch ON (II).
4. Measure the voltage between the climate control unit 40P connector No. 20 terminal and body ground.
Is there battery voltage?
YES - Go to step 5.
NO - Repair open in the wire between the No. 30 (7.5 A) fuse in the driver's under-dash fuse/relay box and the climate control unit.
5. Turn the ignition switch OFF.
6. Check for continuity between the climate control unit connector No. 31 terminal and body ground.
Is there continuity?
YES - Check for loose wires or poor connections at the climate control unit 40P 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.
NO - Check for an open in the wires between the climate control unit and body ground. If the wire is OK, check for poor ground at G503.