GMC 2007 Sierra - Manual (Page 535)

5. Press the locking release lever, turn the bulb
socket counterclockwise and remove it from
the turn signal assembly.
6. Remove the old bulb from the bulb socket.
7. Install a new bulb into the bulb socket.
8. Insert the bulb socket into the turn signal
assembly and turn it clockwise until it locks.
9. Reinstall the turn signal assembly back into
the vehicle placing the hook and posts on
the inner side into the alignment holes
first, then the outer side into the retainer
bracket until you hear a click.
10. Reinstall the headlamp assembly.
Roof Marker Lamps
To replace a roof marker lamp bulb, do the
following:
1. Remove the
two screws and
lift off the lens.
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