GMC 2001 Denali Owner's Manual page 326

Taillamps
6-38
A. Turn Signal Lamp
-
B. Back Up Lamp
C. Stoplamp
1. Use a screwdriver to
remove the two screws
from the rear
lamp assembly.
2. Remove the rear lamp assembly.
3. Press the release tab and turn the bulb
socket counterclockwise to remove it from the
taillamp housing.
5. Press a new bulb into the socket, insert it into the
taillamp housing and turn the socket clockwise into
the taillamp housing until it clicks.
6. Reinstall the rear lamp assembly and tighten
the screws.
4. Pull the bulb straight out
from the socket.