Main Power Supply and Ground Circuit Check
POWER SUPPLY CIRCUIT CHECKCheck power supply circuit for air conditioner system.
FRONT A/C CONTROL UNIT CHECK
Check power supply circuit for front A/C control unit with ignition switch ON.
1. Disconnect front A/C control unit harness connector.
2. Connect voltmeter from harness side.
3. Measure voltage across terminal No. (1), (28) and body ground.
Check body ground circuit for front A/C control unit with ignition switch OFF.
1. Disconnect front A/C control unit harness connector.
2. Connect ohmmeter from harness side.
3. Check for continuity between terminal No. (8), (30) and body ground.
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.
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.