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 switch "OFF"

Refer to "Shop Manual" and disconnect A/C control unit connector.

Ignition switch "ON"

Measure the voltage between Pin No. 7, 8 (Power) terminal of A/C control unit harness connector and chassis ground.

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Is the measured value within specification?

	▶ Go to "CAN communication Line Inspection" procedure.
	▶ Inspect and repair open or short in circuit, and then go to "Verification of Vehicle Repair" procedure.

Ignition switch "OFF"

Disconnect battery (-) cable.

Refer to "Shop Manual" and disconnect A/C control module and ECM connector.

Measure the resistance between Pin No. 64 (C-CAN High) terminal of ECM harness connector and Pin No. 3 (C-CAN High) terminal of A/C control module harness connector.

Measure the resistance between Pin No. 81 (C-CAN Low) terminal of ECM harness connector and Pin No. 4 (C-CAN Low) terminal of A/C control module harness connector.

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Is the measured value within specification?

	▶ Go to "Component Inspection" procedure.
	▶ Repair open in P-CAN circuit and then go to "Verification of vehicle Repair" procedure.