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 all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.

Has a problem been found?

	▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Power Circuit Inspection" procedure.

Ignition "OFF"

Refer to "Shop Manual" and disconnect Air Mix Potentiometer connector.

Ignition "ON"

Measure voltage between Pin No. 4 (Power) terminal of air mix potentiometer harness conenctor and chassis ground.

Is measured value within specification?

	▶ Go to "Ground Circuit Inspection" procedure.
	▶ Repair open or short in power circuit between Air Mix Potentiometer and A/C Control Module harness connector and then go to "Verification of vehicle Repair" procedure.

Ignition "OFF"

Disconnect Battery (-) terminal.

Refer to "Shop Manual" and disconnect Air Mix Potentiometer connector.

Measure resistance between Pin No. 6 (Ground) terminal of air mix potentiometer harness connector and chassis ground.

Is measured value within specification?

	▶ Go to "Signal Circuit Inspection" procedure.
	▶ Repair open or short in ground circuit between Air Mix Potentiometer and A/C Control Module harness connector and then go to "Verification of vehicle Repair" procedure.

Ignition "OFF"

Disconnect Battery (-) terminal.

Refer to "Shop Manual" and disconnect Air Mix Potentiometer connector and A/C Control Module connector.

Measure resistance between Pin No. 5 (F/B) terminal of air mix potentiometer harness connector and Pin No. 16 (F/B) terminal of A/C control module harness connector.

Ignition "OFF"

Disconnect Battery (-) terminal.

Refer to "Shop Manual" and disconnect Air Mix Potentiometer connector.

Measure resistance between Pin No. 5 (Signal) terminal of air mix potentiometer harness connect and chassis ground.

Is measured value within specification?

	▶ Go to "Component Inspection" procedure.
	▶ Repair open or short in signal circuit between Air Mix Potentiometer and A/C Control Module harness connector and then go to "Verification of vehicle Repair" procedure.