2017 Cadillac XTS bulb fitment uses D3S bulbs for both the low-beam and high-beam headlights. The supplied fitment data does not identify a separate bulb variation by headlight type, so verify the existing headlamp assembly before ordering.
- Front turn signals and parking lights use 7444NA bulbs.
- Front side markers use 194NA bulbs.
- Reverse lights use 921 bulbs.
- Brake lights, center stop light, daytime running lights, tail lights, rear turn signals, and rear side markers are LED.
- License plate and interior applications may use either 2825 or 98 bulbs.
- The dome light uses 2886X, while the trunk light may use 194 or 7441.
- The vanity light uses 7065, and map lights are LED.
No fog-light bulb fitment is listed for this model year. Confirm the bulb number and socket style against the original component when multiple options are shown.