Pontiac 2002 Grand Prix - Manual (Page 306)

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5. Remove the old bulb from the socket.
6. Place the new bulb into the socket.
7. Turn the bulb socket a quarter turn clockwise to
reinstall it.
8. Carefully reinstall the headlamp assembly.
Be careful to avoid scratching or chipping the paint
on the vehicle.
9. Reinstall the two bolts on the top of the
headlamp assembly.
10. Close the hood.
Center High-Mounted Stoplamp (CHMSL)
1. Open the trunk.
2. Reach through the access opening in the trunk and
remove the slotted vent by squeezing the ends and
pulling down.