Many malfunctions in the electrical system are caused by poor harness/terminal conditions. 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 Driver air mix actuator and A/C control unit main harness connector.

Measure resistance between WARM terminal of Driver air mix actuator harness connector and WARM terminal of A/C-ECU harness connector.

Measure resistance between COOL terminal of Driver air mix actuator harness connector and COOL terminal of A/C-ECU harness connector.

Is the measured resistance within specifications?

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

Ignition "OFF"

Disconnect Driver air mix actuator and A/C control unit main harness connector.

Measure resistance between WARM terminal of Driver air mix actuator harness connector and chassis ground .

Measure resistance between COOL terminal of Driver air mix actuator harness connector and chassis ground .

Is the measured resistance within specifications?

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