Pontiac 2002 Bonneville - Manual (Page 338)

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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.