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 "Power Circuit Inspection" procedure.

IG "OFF" and disconnect A/C relay.

IG "ON"

Measure voltage between battery power supply terminals of A/C relay harness connector and chassis ground.

Is the measured voltage within specification ?

	▶ Go to "Control Circuit Inspection" procedure.
	▶ Check the fuse between Battery and A/C relay. ▶ Check Chassis ground for looseness. ▶ Repair open or short to ground in power harness and go to "Verification of Vehicle Repair" procedure.

IG "OFF" and disconnect A/C Relay and ECM connector.

Measure the resistance between control terminal of A/C relay harness connector and chassis ground.

Is the measured resistance within specification ?

	▶ Go to "Check open in harness" as follows.
	▶ Repair short in coil control harness and go to "Verification of Vehicle Repair" procedure.

IG "OFF" and disconnect A/C relay and ECM connector.

Measure the resistance between control terminal of A/C relay harness connector and A/C relay control terminal of ECM harness connector.

Is the measured resistance within specification ?

	▶ Go to "Component Inspection" procedure.
	▶ Repair open in coil control harness and go to "Verification of Vehicle Repair" procedure.