GMC 2013 Sierra Denali Owner's Manual page 342

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For the proper type of replacement
bulbs, see
.
For any bulb changing procedure
not listed in this section, contact
your dealer.
Halogen bulbs have pressurized
gas inside and can burst if you
drop or scratch the bulb. You or
others could be injured. Be sure
to read and follow the instructions
on the bulb package.
A. Side Marker Lamp
B. High-Beam Headlamp
C. Low-Beam Headlamp
D. Park/Turn Signal Lamp
To replace one of these bulbs:
1. Open the hood. See
2. When replacing a driver side
bulb on a vehicle with duel
batteries, see your dealer.
3. When replacing a bulb on the
passenger side, remove the
Engine Air Cleaner cover. See
.
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.

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