Pontiac 2005 Bonneville - Manual (Page 328)

Headlamps
1. Reach behind the headlamp assembly, push in and
turn the bulb assembly counterclockwise to remove
the bulb assembly from the headlamp assembly.
2. Lift the tabs to remove the bulb from the assembly.
3. Replace the bulb.
4. Push the bulb assembly in and turn it clockwise to
install the bulb assembly into the headlamp
assembly.
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