Buick 1998 Century Owner's Manual page 291

Headlamps
I. Pull up on the headlamp retainers to release the
2. Slide the headlamp assembly out of the slots.
assembly locator tabs.
3. Lift the plastic locking tab on the electrical
connector and pull the connector from the headlamp
bulb socket.
4. Connect the new headlamp assembly to the wiring
harness, making sure the connector tab snaps
into place.
5 . Insert the headlamp into the slots in the fascia.
6. Slide the retainers downward until they are
fully seated.
Headlamp Aiming
Your vehicle has a modular headlamp system. These
headlamps have horizontal and vertical aim indicators.
The aim has been optically pre-set at the factory and
should need no further adjustment.
If ybttftrehicle is damaged in an accident and the
headlamp aim seems
to
be affected, see your dealer.
Headlamps on damaged vehicles may require
recalibration of the vertical and horizontal aim by
your dealer.