GMC 2012 Sierra - Manual (Page 426)

Black plate (40,1) GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
10-40 Vehicle Care
3. When replacing a bulb on the
passenger side, remove the
Engine Air Cleaner cover. See
Engine Air Cleaner/Filter on
page 10‑17 for more information.
4. Reach in and access the bulb
sockets from inside the engine
compartment.
5. Turn the bulb socket
counterclockwise to remove it
from the headlamp assembly
and pull it straight out.
6. Unplug the electrical connector
from the old bulb by releasing
the clips on the bulb socket.
7. Replace it with a new bulb.
8. Plug in the electrical connector.
9. Reinstall the new bulb socket
into the headlamp assembly and
turn it clockwise to secure.
Pick-Up Box Identification
and Fender Marker
Lamps
The pick-up box identification lamps
are LEDs. For replacement of the
LED lighting assembly contact your
dealer.
To replace a pickup box fender
marker lamp bulb:
1. Press the tab from the back to
remove the lamp.
2. Turn the bulb socket
counterclockwise to remove
from the lamp assembly.
3. Gently pry the bulb from the
socket.
4. Install the new bulb in socket.
5. Reinstall socket into lamp
assembly.
6. Reinstall the lamp assembly.
Taillamps (Chassis Cab
Models)
A. Backup Lamp
B. Stoplamp/Taillamp/Turn
Signal Lamp
To replace one of these bulbs:
1. Remove the four screws.
2. Lift the lens off the lamp
assembly.
3. Turn the old bulb
counterclockwise and pull the
it straight out from the socket.