Oldsmobile 1999 Alero - Manual (Page 255)

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To check the aim, the vehicle should be properly
prepared as follows:
D The vehicle must have all four tires on a perfectly
level surface.
D If necessary, pads may be used on an uneven surface.
D The vehicle should not have any snow, ice or mud
attached to it.
D The vehicle should be fully assembled and all other
work stopped while headlamp aiming is being done.
D There should not be any cargo or loading of the
vehicle, except it should have a full tank of fuel and
one person or 160 lbs. (75 kg) on the driver’s seat.
D Close all doors.
D Tires should be properly inflated.
D Rock the vehicle to stabilize the suspension.
Start with the horizontal aim. The adjustment screws
can be turned with an E8 Torx
R
socket or a
T15 Torx
R
screwdriver.
Once the horizontal aim is adjusted, then adjust the
vertical aim.