Pontiac 2004 Bonneville Owner's Manual page 331

4. Tip the headlamp assembly and while pressing the
release, turn the bulb and socket counterclockwise
to remove them.
5. Replace the bulb and reinstall the socket. Then
reconnect the wiring harness to the lamp assembly.
6. Slide the lamp assembly back into place by lining
up the track on the bottom of the assembly with
the guide on the vehicle. Then connect the outboard
snap and secure the lamp assembly with the
two bolts.
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