Chevrolet 2008 Avalanche Owner's Manual page 402

Taillamps, Turn Signal, Sidemarker,
Stoplamps and Back-up Lamps
To replace one of these bulbs, do the following:
1. Open the tailgate. See Tailgate on page 2-22 for
more information.
5-52
A. Stoplamp/Turn
Signal/Taillamp
B. Back-up Lamp
C. Stoplamp/Turn
Signal/Taillamp
D. Sidemarker Lamp
3. Pull the taillamp assembly rearward until you
disengage the outer pins on the taillamp assembly
from the vehicle.
4. Press the release tab, if the bulb socket has one,
and turn the bulb socket counterclockwise to
remove it from the taillamp assembly.
5. Pull the old bulb straight out from the bulb socket.
6. Press a new bulb into the bulb socket and insert the
bulb socket into the taillamp assembly. Turn the
bulb socket clockwise into the taillamp assembly
until it clicks.
7. Reinstall the taillamp assembly making sure to line
up the pins with the vehicle.
2. Remove the two
screws from the
taillamp assembly.