Cadillac 2011 CTS Coupe Owner's Manual page 360

To replace a front 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.
3. Remove the electrical connector
from the bulb by lifting the
two plastic clips.
4. Remove the bulb socket from
the lamp housing by turning the
bulb socket one-quarter turn
counterclockwise.
5. Pull the old bulb from the lamp
housing keeping the bulb
straight as you pull it out.
6. Install a new bulb.
7. Reinstall the electrical connector
by pushing in the two plastic
clips.
8. Push the bulb socket into the
lamp housing and turn the
socket one quarter turn
clockwise.
To replace one of these bulbs:
1. Push the tab to remove the
license plate lamp.
2. Turn the license plate lamp
assembly down to remove it.
3. Turn the socket
counterclockwise and remove it.
4. Pull the bulb straight out to
remove it.
5. Push the new bulb straight into
the socket.
6. Reverse Steps 1 through 3 to
reinstall the license plate lamp
assembly.