GMC Terrain Denali 2015 Owner's Manual page 247

10-30 Vehicle Care
3. Remove the five attachment
nuts (1) securing the taillamp
assembly to the liftgate.
4. Disengage the retaining hook (2)
and pull the taillamp assembly
out of the vehicle liftgate.
5. Disconnect the lamp wiring
harness.
6. Turn the bulb socket
counterclockwise and pull it out.
7. Pull the bulb straight out of the
socket.
8. Install the new bulb.
9. Push the bulb socket in and turn
it clockwise.
10. Reverse Steps 2 5 to reinstall
lamp assembly.
Back Up Lamp
Removal of the lamp assembly is
not required to replace the back-up
lamp bulb.
To replace one of these lamps:
1. Open the liftgate. See Liftgate
on page 2-9.
2. Remove the interior trim access
panel.
3. Turn the bulb socket
counterclockwise and pull it out.
4. Pull the bulb straight out of the
socket.
5. Install the new bulb.
6. Push the bulb socket in and turn
it clockwise.