GMC 2010 Sierra - Manual (Page 524)

Headlamps
To replace one of these bulbs:
1. Open the hood. See Hood Release on page 6‑15
for more information.
2. If you are replacing the bulb on the passenger side
remove the Engine Air Cleaner cover. See Engine
Air Cleaner/Filter on page 6‑22 for more
information.
3. Reach in and access the bulb sockets from inside
the engine compartment.
4. Turn the bulb socket counterclockwise to remove it
from the headlamp assembly and pull it
straight out.
5. Unplug the electrical connector from the old bulb
by releasing the clips on the bulb socket.
6. Replace it with a new bulb socket.
7. Plug in the electrical connector to the new bulb
socket.
8. Reinstall the new bulb socket into the headlamp
assembly and turn it clockwise to secure.
9. Close the hood.
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