For the 2015 Cadillac CTS, headlight bulb fitment varies by body style and headlight configuration. The low beam uses H11 or, on a coupe with HID headlights, D1S. Sedan models use D3S for the low beam. High-beam fitment includes H9; the coupe with HID headlights uses D1S, while the sedan uses D3S. Confirm the vehicle body style and headlight assembly before ordering.
- Fog lights are listed with H11 LED or H16 LED options.
- Front turn signals are LED, with a 12272NA option on the coupe. Rear turn signals, brake lights, center stop light, tail lights, and rear side markers are LED.
- Reverse lights use 921 or LED bulbs. Coupe parking lights and front side markers use 2825, 98, or 194NA options; sedan parking lights are LED.
- Interior fitment includes 2825 or 98 for the dome light, 906 for the glove box and interior light, PC175 map lights, 211-2 trunk lighting, and 6612F vanity lights.