Oldsmobile 1999 Alero - Manual (Page 254)

yellow blue
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3. Lift the headlamp assembly forward, out of the
mounting bracket.
4. Twist the bulb assembly retainer counterclockwise
one - sixth of a turn and pull out the bulb assembly.
5. Unclip the bulb assembly from the wiring harness.
6. Reverse Steps 1 through 4 to replace the bulb
assembly and headlamp housing.
Headlamp Aiming
Your vehicle has a headlamp system equipped with
horizontal and vertical aim indicators. The aim has been
pre
- set at the factory and should need no further
adjustment. This is true even though your vertical and
horizontal aim indicators may not fall exactly on the “0”
(zero) marks on their scales.
If your vehicle is damaged in an accident, the headlamp
aim may be affected. Aim adjustment may be necessary
if it is difficult to see lane markers (for horizontal aim),
or if oncoming drivers flash their high beams at you (for
vertical aim). If you believe your headlamps need to be
re
- aimed, we recommend that you take it to your dealer
for service; however, it is possible for you to re - aim
your headlamps as described in the following procedure.
NOTICE:
To make sure your headlamps are aimed
properly, read all the instructions before
beginning. Failure to follow these instructions
could cause damage to headlamp parts.