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 short to battery in harness
1. Ignition "OFF"
2. Disconnect ambient sensor and A/C control unit main harness connector.
3. Ignition "ON"
4. Measure voltage between Signal (F/B) terminal of ambient sensor harness connector and chassis ground.

Specification : 0V





5. Is the measured voltage within specification?





Check for open in harness
1. Ignition "OFF"
2. Disconnect ambient sensor and A/C control unit main harness connector.
3. Measure resistance between Signal (+) terminal of ambient sensor harness connector and Signal (+) terminal of A/C-ECU harness connector.

Specification : 1 Ohm below





4. Is the measured resistance within specification?






Ground Circuit Inspection

Check for open in harness
1. Ignition "OFF"
2. Disconnect ambient sensor and A/C control unit main harness connector.
3. Measure resistance between ground terminal of ambient sensor harness connector and ground terminal of A/C-ECU harness connector.

Specification : 1 Ohm below





4. Is the measured resistance within specification?