Hummer 2005 H2 - Manual (Page 363)

2. Remove the two
screws from the rear
lamp assembly
and remove the rear
lamp assembly.
3. Turn the bulb socket counterclockwise to remove it
from the taillamp housing.
4. Pull the bulb straight
out from the socket.
5. Press a new bulb into the socket, insert it into the
taillamp housing and turn the socket
counterclockwise until it is locked in place.
6. Reinstall the rear lamp assembly and tighten
the screws.
Your vehicle may have a taillamp in the bumper. To
replace it, do the following:
5-51