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

Ignition "OFF".

Disconnect EPB ECU connector.

Ignition "ON".

Measure voltage between power terminal of EPB ECU harness connector and chassis ground.

Is measured value within specification

	▶ Go to "Ground Circuit Inspection" procedure.
	▶ Repair open or short in power circuit between battery and EPB ECU harness connector and then go to "Verification of vehicle Repair" procedure.

Ignition "OFF".

Disconnect Battery (-) terminal.

Disconnect EPB ECU connector.

Measure resistance between ground terminal of EPB ECU harness connector and chassis ground.

Is measured value within specification?

	▶ Go to "IG Power Circuit Inspection" procedure.
	▶ Repair open or short in ground circuit between battery and EPB ECU harness connector and then go to "Verification of vehicle Repair" procedure.

Ignition "OFF".

Disconnect EPB ECU connector.

Measure voltage between IG power terminal of EPB ECU harness connector and chassis ground.

Ignition "ON".

Measure voltage between IG power terminal of EPB ECU harness connector and chassis ground.

Is measured value within specification?

	▶ Go to "Component Inspection" procedure.
	▶ Repair open or short in IG power circuit between battery and EPB ECU harness connector and then go to "Verification of vehicle Repair" procedure.