Many malfunctions in the electrical system are caused by poor harness(es) and terminal condition.

Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, 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.

IG "OFF"

Disconnect solenoid valve ASS'Y connector.

IG "ON"

Measure voltage between air spring valve's power terminal of the solenoid valve ASS'Y harness connector and chassis ground.

Is the measured value within specification?

	▶ Go to "Control Circuit Inspection" procedure.
	▶ Repair open or short in power circuit between ALS ECU and solenoid valve ASS'Y and then, go to "Verification of vehicle Repair" procedure.

IG "OFF"

Disconnect solenoid valve ASS'Y connector and ALS ECU connector.

Measure resistance between air spring valve's control terminal of the solenoid valve ASS'Y harness connector and air spring valve's control terminal of the ALS ECU harness connector.

Is the measured value within specification?

	▶ Go to "Check for short" procedure.
	▶ Repair open in control circuit between ALS ECU and solenoid valve ASS'Y and then, go to "Verification of vehicle Repair" procedure.

IG "OFF"

Disconnect solenoid valve ASS'Y connector and ALS ECU connector.

Measure resistance between air spring valve's control terminal of the solenoid valve ASS'Y harness connector and chassis ground.

Is the measured value within specification?

	▶ Substitute with a known-good air spring valve(inside solenoid valve ASS'Y) and check for proper operation. If problem is corrected, replace air spring valve(inside solenoid valve ASS'Y) and then go to "Verification of Vehicle Repair" procedure.
	▶ Repair short in control circuit between ALS ECU and solenoid valve ASS'Y and then, go to "Verification of vehicle Repair" procedure.