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 next 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 parameter displayed within specification?

	▶ 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 BSD ECU connector.

Ignition "ON".

Measure voltage between power terminal of BSD 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 BSD ECU harness connector and then go to "Verification of vehicle Repair" procedure.

Ignition "OFF".

Disconnect Battery (-) terminal.

Disconnect BSD ECU connector.

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

Is measured value within specification?

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