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Buick 1998 Riviera Owner's Manual page 275

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The vehicle should not have any snow, ice or mud
attached to it.
The vehicle should be fully assembled and all other
work stopped while headlamp aiming is being done.
There should not be any cargo or loading
of the
vehicle, except it should have a full tank of gas and
one person or 160 lbs. (75 kg) on the driver's seat.
Tires should be properly inflated.
Rock the vehicle to stabilize the suspension.
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.
For the vertical adjustment, state inspection stations
generally will allow a reading of plus 0.76 degrees or
minus 0.76 degrees from the center of the bubble.
It is recommended that the upper limit not exceed plus
0.4 degrees from the center of the bubble. Other drivers
may flash their high beams at you if your adjustment
is much above plus 0.4 degrees.
If you find that the headlamp aiming needs adjustment,
follow these steps:
Start with the vertical headlamp
aim.
Don't try to adjust
the horizontal aim first. Adjustment screws
can
be
turned with an E8 Torx@socket or T15 Torx screwdriver.
1. Check the vertical aim for each headlamp. The
vehicle must be on a level surface. Turn the vertical
aiming screw until the bubble in the level is centered
at 0 (zero).
6-34

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