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 connectors for looseness, poor connection, bending, corrosion, contamination, deterioration,or damage.

Has a problem been found?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Signal circuit Inspection" procedure.

Ignition "OFF".

Disconnect Auto Head Lamp Leveling Sensor harness connector.

Ignition "ON", HEAD LAMP "ON". (ENGINE "OFF")

Measure voltage between Head Lamp (LOW) ON/OFF Signal terminal of AHLS ECU harness connector and chassis ground.

Is "voltage" display near the specified value?

	▶ Check the condition of connected part and go to "Verification Vehicle Repair" procedure.
	▶ Check for circuit in harness between AHLS ECU and headlamp switch signal line. ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure. ▶ After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation.