GMC 2006 Sierra - Manual (Page 475)

Bulb Replacement
For the proper type of replacement bulbs, see
Replacement Bulbs on page 5-70.
For any bulb changing procedure not listed in this
section, contact your dealer.
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 a headlamp bulb, do the following:
1. Open the hood. See Hood Release on page 5-13
for more information.
2. Remove the two pins on the top of the headlamp
assembly. To remove the pins, turn the outer pin
outward and pull it straight up. To remove the
inner pin, turn it in and pull it straight up.
5-63