GMC 2012 Savana Owner's Manual page 289

4. Remove the third nut (C) from
the upper outboard side of
the lamp.
5. Remove the taillamp assembly
from the vehicle.
6. Remove the taillamp/turn signal
lamp (A) or back up lamp (B)
bulb socket by turning it
counterclockwise one quarter
turn and pulling it out of the lamp
assembly.
7. Remove the bulb by pulling it
straight out.
8. Push the new bulb into the
socket.
9. Reinstall the bulb socket by
turning it clockwise into the lamp
assembly.
10. Reverse Steps 1 through 5 to
reinstall the taillamp assembly
and applique.
The Center High-Mounted
Stoplamp (CHMSL) is located
above the rear doors at the center
of the vehicle.
To replace a bulb:
1. Remove the two screws from the
CHMSL assembly.
2. Remove the CHMSL assembly.