GMC 2012 Savana Owner's Manual page 288

4. Remove the bulb from the
socket by pulling it straight out.
5. Replace the bulb.
6. Turn the bulb socket clockwise
to reinstall it in the lamp
assembly.
7. Reinstall the lamp assembly into
the grille until the outboard clip
snaps into place.
To replace a taillamp/turn signal
lamp or back up lamp bulb:
1. Remove the two inboard nuts
from the inside of the taillamp
assembly.
2. The third nut (C) is under the
applique piece (B) above
the lamp. Remove the two
inboard applique nuts. Pull the
applique (B) straight rearward
slightly to clear the studs. Then
rotate the applique (B) just far
enough to gain access to the
outer push pins (A).
3. Carefully disconnect the push
pins (A) from the applique
bracket