Chevrolet 2006 Avalanche Owner's Manual page 418

A. Sidemarker Lamp
B. Front Turn Signal/Parking Lamp
5-58
4. Press the locking release lever (the sidemarker
lamp does not have a locking release lever), turn
the bulb socket counterclockwise and remove it from
the turn signal/parking lamp assembly.
5. Remove the old bulb from the bulb socket.
6. Put the new bulb into the bulb socket.
7. Put the bulb socket into the turn signal assembly
and turn it clockwise until it locks (the sidemarker
lamp does not lock into place).
8. Place the inboard end of the turn signal/parking
lamp assembly into the pocket.
9. Push the outboard side of the assembly in until the
release clip snaps into place.