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.

IG Key "OFF".

Take off a connector of BSD switch.

IG "ON" or Engine "ON".

Measure voltage between battery terminal terminal of BSD switch harness connector and chassis ground.

Is the measured voltage within specification ?

	▶ Go to next procedure.
	▶ Check for open or short in the pressure sensor circuit. ▶ Substitute with a known-good BSD ECU and check for proper operation. If the problem is corrected, replace BSD ECU and then go to "Verification of Vehicle Repair" procedure.

IG Key "OFF".

Disconnect BSD switch connector.

Measure resistance between terminal BSD switch harness connector and chassis ground.

Is the measured resistance within specifications?

	▶ Substitute with a known-good BSD switch and check for proper operation. If the problem is corrected, replace BSD switch and then go to "Verification of Vehicle Repair" procedure.
	▶ Check for open or contact resistance in ground harness. ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.