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.

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.
	▶ Go to "W/Harness Inspection" procedure.

Ignition "OFF"

Disconnect Water temp.sensor and A/C control unit main harness connector.

Ignition "ON"

Measure voltage between Power terminal of Water temp.sensor harness connector and chassis ground .

Is the measured voltage within specification?

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

Ignition "OFF"

Disconnect Water temp.sensor and A/C control unit main harness connector.

Measure resistance between Signal(+) terminal of Water temp.sensor harness connector and Signal(+) terminal of A/C-ECU harness connector.

Is the measured resistance within specification?

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