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 AHLS ECU and leveling actuator(LH/RH) harness connector.

Measure resistance between Signal terminal of leveling actuator(LH/RH) harness connector and chassis ground .

Is the measured resistance within specification?

	▶ Go to Check short to battery in harness as follows.
	▶ Check for short to ground in signal harness. ▶ 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.

Ignition "OFF"

Disconnect AHLS ECU and leveling actuator(LH/RH) harness connector.

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

Measure voltage between Signal(+) terminal of leveling actuator(LH/RH) harness connector and chassis ground.

Is the measured resistance within specification?

	▶ Check the condition of connected part and go to "Verification Vehicle Repair" procedure.
	▶ Check for short to battery circuit in leveling actuator output harness. Repair as necessary and go to "Verification Vehicle Repair" procedure. ▶ After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation.