W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration,or damage.
3. Has a problem been found?






Signal Circuit Inspection

Check for open in harness
1. Ignition "OFF"
2. Disconnect Driver air mix actuator and A/C control unit main harness connector.
3. Measure resistance between Signal (F/B) terminal of Driver air mix actuator harness connector and Signal (F/B) terminal of A/C-ECU harness connector.

Specification : 1 Ohm below





4. Is the measured resistance within specification?





Check short to ground in harness
1. Ignition "OFF"
2. Disconnect Driver air mix actuator and A/C control unit main harness connector.
3. Measure resistance between Signal (F/B) terminal of Driver air mix actuator harness connector and chassis ground.

Specification : Infinity





4. Is the measured resistance within specification?






Power Circuit Inspection

Check power in harness
1. Ignition "OFF"
2. Disconnect Driver air mix actuator and Connect A/C control unit main harness connector.
3. Ignition "ON"
4. Measure voltage between Sensor REF (5V) terminal of Driver air mix actuator harness connector and chassis ground.

Specification : approx. 5V





5. Is the measured voltage within specification?






Ground Circuit Inspection

Check for open in harness
1. Ignition "OFF"
2. Disconnect Driver air mix actuator and A/C control unit main harness connector.
3. Measure resistance between Sensor ground (-) terminal of Driver air mix actuator harness connector and Sensor ground (-) terminal of A/C-ECU harness connector.

Specification : 1 Ohm below





4. Is the measured resistance within specification?