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Instructions on how to change a headlamp bulb are on page 5-56 in the 2003 Pontiac Bonneville Owner's Manual. If you do not have an Owner's Manual, you can download a PDF version at the link below (direct link) 2003 Pontiac Owner's Manual
Firmly pull the headlamp forward (towards you) to disengage the ball and socket attachment at the rear of the headlamp. Disconnect the electrical connector. Remove and replace the bulbs as necessary. Reassemble and check. Good luck.
Open the hood.
Remove the front turn signaVparking lamp
Pull the assembly away from the vehicle.
Unscrew the black retainer ring that holds the bulb
assembly in place.
Pull the bulb assembly straight up from the lamp
Unhook the electrical connector by lifting up the
blue tabs and pulling the bulb out.
Halogen bulbs contain gas under pressure. Handling a bulb improperly
could cause it to shatter into flying glass fragments. To help avoid
Turn off the lamp switch and allow the bulb to cool before changing the bulb.
Leave the lamp switch OFF until the bulb change is complete.
Always wear eye protection when changing a halogen bulb.
Handle the bulb only by its base. Avoid touching the glass.
Keep dirt and moisture off the bulb.
Properly dispose of the used bulb.
Keep halogen bulbs out of the reach of children.
Raise the hood.
Remove the headlamp assembly bolts from the upper fascia support.
Slide the headlamp assembly outward enough to release the headlamp bracket tabs from the slots in the upper fascia support.
Position the headlamp assembly away from the vehicle body to access the electrical connector.
Disconnect the electrical connector from the headlamp assembly.
Remove the headlamp assembly from the vehicle.
Disconnect the electrical connector from the headlamp bulb/socket.
Remove the headlamp bulb/socket retainer ring from the headlamp, by turning counterclockwise.
Remove the headlamp bulb/socket from the headlamp assembly.