W/Harness Inspection

Air Conditioner
B1284 Direction Potentiometer Short (High) - Auto Defog - Inspection/Repair:_:W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor connection. 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 Auto Defog sensor and A/C control unit main harness connector.
3. Ignition "ON"
4. Measure voltage between Signal terminal of Auto Defog sensor harness connector and chassis ground.

Specification :approx. 0V




5. Is the measured voltage within specification?






Ground Circuit Inspection

Check power in harness
1. Ignition "OFF"
2. Disconnect Auto Defog sensor and A/C control unit main harness connector.
3. Measure resistance between Sensor ground(-) terminal of Auto Defog sensor harness connector and Sensor ground(-) terminal of A/C-ECU harness connector.

Specification :1Ohms below




4. Is the measured resistance within specification?