On each headlamp assembly, there will be either one or two plastic nuts that you can turn.
If you only have one nut on each, that will adjust the vertical aim of the headlights.
If you have two nuts on each, one will adjust the vertical and the other will adjust the horizontal.
Park
your car on a level ground 30 feet from a wall and measure the height
from the ground to the bulb and mark on a wall (do this for highs beams
and low beams if the bulbs are separate, if highs and lows are the same
bulb, only do it for the lows)
If the headlights read VOR, then
aim the brightest part or cutoff part just below the mark on the wall.
If it says VOL or nothing, aim them 2 inches below the mark on the wall.
In the U.S. the type,
adjustments, and illumination factors of all automobile lighting devices
are regulated by the Federal Motor Vehicle Safety Standard 108. The
headlights must function and be adjusted correctly. Your high beams must
disperse their beams straight forward and low beams down and to the
right while safely providing illumination without too much or too little
glare. It is wise to check the headlight adjustment on your Mercedes at
least every year. Doing it yourself will save you time and money. It
will also make driving safer for you and others you may meet on the road
at night. All it takes is time, some basic tools and a little patience.
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