Buick 2007 LaCrosse Owner's Manual page 396

3. Pull up on the plastic retaining clip (C) while
pushing rearward on the headlamp. Align the
square cut-out on the retaining clip with
the notch on the headlamp.
4. Remove the screw (A) from the metal
headlamp retainer to pull up and release the
headlamp assembly.
5. Remove the push pin (B) retaining the front
fascia.
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6. Pull forward on the front fascia and then pull
the headlamp assembly out from the vehicle.
Moving the headlamp up and down slightly
may help with its removal.
You may have someone assist you with
this step.
7. Remove the access cover from behind the
bulb being replaced.
8. Turn the bulb socket one-quarter of a turn to
remove it from the headlamp assembly.
9. Holding the base of the socket, pull the old
bulb from the socket.
10. Replace with a new bulb.
11. Reverse all the steps to reassemble the
headlamp assembly.
When replacing the plastic retaining clip,
push down on it while pushing rearward on
the headlamp, making sure the headlamp
assembly is secure.