Cadillac 2001 Catera Owner's Manual page 287

3. Turn the socket counterclockwise to remove it.
4. To remove the bulb, turn it counterclockwise. When
you replace the bulb, you need to push it in and twist
it clockwise into place.
5. Reinstall the socket by turning it clockwise in the
lamp housing.
6-36
Taillamp and Backup Lamp
1. Open the trunk to access the lamp housing.
2. Remove the plastic cover, located on the underside
of the trunk lid, by squeezing the two tabs together.
This will expose the back of the lamp housing.
3. Remove the back of the lamp housing, located on the
underside of the trunk lid, by squeezing the two tabs
as shown.
4. To remove the bulb, turn it counterclockwise. To
replace the bulb, push it in and twist it clockwise.
5. Reinstall the lamp housing and cover by reversing
the steps listed previously.