GMC 2009 Sierra - Manual (Page 364)

Bulb Replacement
For the proper type of replacement bulbs,
see Replacement Bulbs on page 5-57.
For any bulb changing procedure not listed
in this section, contact your dealer/retailer.
Halogen Bulbs
{ CAUTION:
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.
Headlamps
To replace one of these bulbs:
1. Open the hood. See Hood Release on page 5-11
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 5-17 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.
5-52