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 Cruise switch connector.

IG "ON"

Measure the voltage between power supply terminals of main relay harness connector and chassis ground.

Is the measured voltage within specification?

	▶ Go to "Check short in harness" procedure.
	▶ Check the fuse between battery and main relay. ▶ Repair open or short to ground in power harness and go to "Verification of Vehicle Repair" procedure.

IG "OFF" and disconnect the main relay and ECM connector.

Measure the resistance between main relay 'ON' power terminal of main relay harness connector and main relay 'ON' power terminals of ECM harness connector.

Is the measured resistance within specification ?

	▶ Go to "Check short to ground in harness" procedure.
	▶ Repair open in harness and go to "Verification of Vehicle Repair" procedure .

IG "OFF" and disconnect the main relay and ECM connector.

Measure the resistance between main relay 'ON' power terminal of main relay harness connector and chassis ground.

Is the measured resistance within specification ?

	▶ Go to "Control Circuit Inspection" procedure.
	▶ Repair short to ground in harness and go to "Verification of Vehicle Repair" procedure.

IG "OFF" and disconnect the main relay and ECM connector.

Measure the resistance between control terminal of main relay harness connector and chasses ground.

Is the measured resistance within specification ?

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

IG "OFF" and disconnect the main relay and ECM connector.

Measure the resistance between control terminal of main relay harness connector and main relay control terminal of ECM harness connector.

Is the measured resistance within specification ?

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