2004 Cadillac XLR bulb fitment uses D1S bulbs for both the low-beam and high-beam headlights. The supplied fitment data lists the same D1S application for each headlight function, with no separate projector or non-projector distinction provided.
For additional exterior lighting, the fog lights use 9045 bulbs. Front turn signals and daytime running lights use 3757A bulbs, while the reverse lights use 3156 bulbs. Several rear lighting functions are factory LED applications rather than replaceable conventional bulbs.
- Rear LED lighting: Brake lights, the center stop light, tail lights, rear turn signals, and rear side markers are listed as LED.
- Parking, front side marker, and license plate lights: Fitment is listed as 2825 or 98, so verify the installed bulb before ordering.
- Interior and accessory lighting: The map light uses 212-2, the trunk light uses PC168, and the interior light uses 561. Glove-box and step lighting are listed as 194 or 7441.
Confirm the existing bulb and socket where multiple options are shown, and use the correct D1S replacement for either headlight beam.