2009 Cadillac CTS Owner's Manual - Page 365

The vehicle may have HID headlamps. After the vehicle's HID headlamp bulb has been replaced, you may notice that the beam is a slightly different shade than it was originally. This is normal. Front Turn Signal and Fog Lamps Halogen Bulbs { CAUTION: Halogen bulbs have pressurized gas inside and can burst if you drop or scratch the bulb. You or others could be injured. Be sure to read and follow the instructions on the bulb package. To replace fog lamp bulb: 1. Pull out the push-pins located on the underside of the protection shield to remove the shield. 2. Reach up behind the front bumper area from under the vehicle to access the lamp housing. 5-59