Pontiac None Aztek Owner's Manual page 348

8. Unhook the electrical connector by lifting up the
gray tabs and separate the connector from the
bulb base.
9. Install the new bulb into the electrical connector.
Push the bulb firmly enough so that the gray tabs
hook over the tab on the bulb.
10. Put the bulb assembly back into the lamp housing
and turn the bulb socket one-quarter of a turn
counterclockwise.
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11. Reinstall the bulb access cover making sure it is
in place.
12. Align the retaining clips on the back of the headlamp
with the rectangular holes in the mounting panel.
13. Push firmly on both ends of the headlamp to snap it
into position.
14. Push the retaining clip down to its original position.