Pontiac 2003 Bonneville Owner's Manual page 312

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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.
0
The vehicle should be normally loaded with a
full tank of fuel and one person or 160 Ibs. (75 kg)
on the driver's seat.
Tires should be properly inflated.
Headlamp aiming is done with the vehicle low beam
lamps. The high beam lamps will be correctly aimed if
the low beam lamps are aimed properly.
The headlamp aiming devices are under the hood near
the headlamps.
If you believe your headlamps need horizontal (lefthight)
adjustment, follow the horizontal aiming procedure.
If you believe your headlamps need only vertical
procedure.
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Adjustment screws can be turned with an E8 Torx@
socket or T i 5 Torx@ screwdriver.
5-53