Pontiac 2004 Bonneville - Manual (Page 329)

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. Push the bulb assembly in
and turn it clockwise to install the bulb assembly into
the headlamp assembly.
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