Xenon HID Headlight D1S/D1R/D2S/D2R Ballast ECU Control Unit for Philips Denso
D1S/D1R/D2S/D2R. This is for one (single) replica ballast (details below). If you have tried changing the bulb and it is still not illuminating then chances are you have had a ballast fail. Ballast Specs.