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Check The Wiring Harness Between The Controller And The Bulb.

If any of the defects below are found, replace the wiring harness between the controller and the bulb.

CAUTION: If the wiring harness between the controller and the bulb is defective, always replace it. Attempting to repair the wiring harness may cause a melted harness wire.
WIRING HARNESS CHECK

Items to be checked Why the controller should be replaced
Wiring harness shield damaged (breakage) Causing abnormal noise
Damaged connector (chipped or cracked plastics, or deformed terminal) Because the damaged part(s) may cause poor connection