Xenon Ballast Control Unit Module - Function and purpose: Replacement ballast control unit for Xenon headlight systems. It controls the ballast to ignite and regulate the Xenon lamp, enabling proper start-up and stable illumination. - Compatibility and identifiers: Product codes include D4R, D4S, DDLT003, KDLT003. Part numbers associated with this module are 85967 52020, 85967 53040, 85967 51050, 85967 51085. - Packaging: Pack of 1 unit. - Identification: Uses alphanumeric designations for identification. - Key benefits: Provides reliable control of the Xenon ballast, supports reliable ignition, and maintains stable light output as a direct replacement part for HID headlight systems using the listed codes and part numbers. - Practical use scenarios: 1) Replacing a failed Xenon ballast control unit in a vehicle to restore HID headlight operation. 2) Maintaining or refurbishing vehicles or fleets that require matching part numbers to preserve headlight performance. 3) Stocking in automotive repair environments for quick installation when HID ballast controllers are needed.