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 "Charging System Inspection" procedure.

Connect GDS to Data Link Connector(DLC).

Engine "ON".

Turn on all electrical load such as headlamp, rear window defogger, and A/C.

Maintain engine speed at about 2500 RPM.

Monitor "Battery Voltage" parameter on "Current Data" with GDS.

Is the parameter displayed within specifications ?

	▶ Go to "Power Circuit Inspection" procedure.
	▶ Check the tension of drive belt, ENG RPM, fuse, terminal of battery, all terminals of alternator are in good condition and check for damaged harness and poor connection between alternator and battery. ▶ Repair as necessary and then go to "Verification of Vehicle Repair" 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?

	▶ Substitute with known-good EPB ECU and check for proper operation. If problem is corrected, replace EPB ECU and then go to "Verification of Vehicle Repair" procedure.
	▶ Repair open or short in ground circuit between battery and EPB ECU harness connector and then go to "Verification of vehicle Repair" procedure.