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 (brake pedal isn't pressed)" procedure.

IG "OFF".

Disconnect brake light switch harness connector.

IG "ON".

Measure voltage between power terminal of brake light switch/brake switch and chassis ground.

Is the measured value within specifications ?

	▶ Go to "Signal circuit inspection" procedure.
	▶ Check for open or blown fuse referring to "Circuit Diagram". ▶ Repair open or short in power circuit and then, go to "Verification of vehicle Repair" procedure.

Ignition "OFF".

Disconnect Battery (-) terminal.

Disconnect Brake lamp switch connector.

Measure resistance between ground terminal of brake lamp switch harness connector and chassis ground.

Is the measured value within specifications ?

	▶ Go to "Component Inspection" procedure.
	▶ Repair open or short in ground circuit between battery and Brake Switch harness connector and then go to "Verification of vehicle Repair" procedure.