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Rear A/C Control Unit Check:

Check power supply circuit for rear A/C control unit with ignition switch ON.

1. Disconnect rear A/C control unit harness connector.
2. Connect voltmeter from harness side.
3. Measure voltage across terminal No. (1) and body ground.

Rear A/C Control Unit Check:

Check body ground circuit for rear A/C control unit with ignition switch OFF.

1. Disconnect rear A/C control unit harness connector.
2. Connect ohmmeter from harness side.
3. Check for continuity between terminal No. (4) and body ground.