Climate Control Power and Ground Circuits Troubleshooting

1. Check the No. 3 (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.

2. Disconnect climate control unit connector B (26P).
3. Turn the ignition switch ON (II).




4. Measure the voltage between the No. 13 terminal of climate control unit connector B (26P) and body ground.

Is there battery voltage?

YES - Go to step 5.

NO - Repair open in the wire between the No. 3 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 No. 15 terminal of climate control unit connector B (26P) and body ground.

Is there continuity?

YES - Check for loose wires or poor connections at climate control unit connector B (26P). 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 wire between the climate control unit and body ground. If the wire is OK, check for poor ground at G401.