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.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration,or damage.

Has a problem been found?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
	▶ Perform following procedures.

Ignition "OFF"

Disconnect Auto defogger sensor actuator and A/C control Module main harness connector.

Ignition "ON"

Measure voltage between Signal terminal of Auto defogger sensor actuator harness connector and chassis ground.

Is measured value within specification?

	▶ Perform following procedures.
	▶ Check for open in harness. ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

Ignition "OFF"

Disconnect Auto defogger sensor actuator actuator and A/C control Module main harness connector.

Measure resistance between Sensor Signal terminal of Auto defogger sensor actuator harness connector and Sensor Signal terminal of A/C control Module harness connector.

Is measured value within specification?

	▶ Go to "Component inspection" procedure.
	▶ Check for open in harness. ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.