Many malfunctions in the electrical system are caused by poor harness(es) 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 "Control Circuit Inspection" procedure.

IG KEY "OFF".

Disconnect EMS Box and ECM.

Measure the resistance between A/C Compressor Relay Control terminal of A/C Compressor Relay harness connector and chassis ground.

Is the measured resistance within specification ?

	▶ Go to "Check open in harness" as follows.
	▶ Repair short in A/C Relay harness and go to "Verification of Vehicle Repair" procedure.

IG KEY "OFF".

Disconnect EMS Box and ECM.

Measure the resistance between A/C Relay control terminal of EMX BOX 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 A/C Relay harness and go to "Verification of Vehicle Repair" procedure.