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

IG "ON".

Press the ESC(ESP) SWITCH.

Measure voltage between ESC(ESP) switch signal terminal of the HECU harness connector and chassis ground.

Is the measured value within specifications?

	▶ Go to "Component Inspection" Procedure.
	▶ Check for open or blown fuse referring to "Circuit Diagram". ▶ Repair open or short in power circuit between battery and HECU harness connector and then, go to "Verification of vehicle Repair" procedure.