Koito Denso KDLT003 DDLT003 D4S D4R Xenon Ballast HID ECU Control Unit
Koito / Denso - 39000-78496, 39000-78515, 39000-78258. This is for a replica ballast (details below). Xenon Ballast. If you have tried changing the bulb and it is still not illuminating then chances are you have had a ballast fail.