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 go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Power Circuit Inspection" procedure.

IG "OFF".

Disconnect TCS/ESC(ESP) OFF Switch connector.

IG "ON".

Measure voltage between power terminal of TCS/ESC(ESP) OFF Switch harness connector and chassis ground.

Is the measured value within specifications ?

	▶ Go to "Signal circuit Inspection" Procedure.
	▶ Repair open or short in power circuit between HECU and TCS/ESC(ESP) OFF Switch harness connector and then go to "Verification of vehicle Repair" procedure.

IG "OFF".

Back probe and measure voltage between signal terminal of TCS/ESC(ESP) OFF Switch harness connector and chassis ground.

Operate TCS/ESC(ESP) OFF Switch.

Is the measured value within specifications ?

	▶ Go to "Component Inspection" procedure.
	▶ Repair open or short in signal circuit between HECU and TCS/ESC(ESP) OFF Switch harness connector and then go to "Verification of vehicle Repair" procedure.