Since the implementation of halogen capsule light bulbs, figuring out how to change them can be a daunting task. The 2006 Pontiac Grand Prix is no exception; however, it's easier to change the light bulbs in this car than in a lot of other vehicles. The Grand Prix uses separate bulbs for low beams and high beams. The low beams are located on the outer edge of the headlight assemblies while the high beams are located on the inner edge of the assemblies. With this in mind, locate the position of the burned out bulb prior to replacing it.
Open the hood to the 2006 Pontiac Grand Prix after making sure the headlight switch is in the off position, and the keys are not in the ignition.
Approach the headlight assembly with the spent headlight in it, and locate the retaining bracket (white) holding the assembly to the frame rail of the Grand Prix.
Lift the retaining bracket up about a quarter of an inch in order to align the notches of the bracket to the riveted tabs on the frame.
Pull the assembly forward away from the front of the car starting with the inner corner of the assembly toward the grill. Keep in mind the wire harness connection is still attached to the assembly, so only pull it far enough to reach behind and disconnect the plug located at the bottom of the assembly.
Place the headlight and bulbs assembly lens down onto a soft towel or blanket.
Disconnect the respective low beam or high beam wire harness.
Turn the plastic base of the headlight counterclockwise a quarter turn to align the retaining tabs with the release notches. Remove the headlight from the headlight assembly.
Put on latex gloves before handling the replacement low beam or high beam headlight. Oil from skin will compromise the life of the headlights if it contacts the glass bulb.
Insert the new bulb into the assembly by aligning the retaining notches to the release tabs, and then turn the base of the headlight 1/4 clockwise to lock it into the headlight assembly. Reconnect the harness to the headlight.
Bring the assembly back to the Grand Prix and reconnect the main wire harness at the bottom of the assembly.
Align the guide pins at the back of the assembly to the locating holes in the front frame rail starting with the outer guide pin first and the inner (toward the grill) guide pin last. Lift the assembly upward while pushing back on the lens to push down on the retaining bracket.
Place the key in the ignition and turn the key to accessory power. Turn on the headlight switch to inspect the headlight for operation.
