Question about 2002 Mercedes-Benz C-Class
The head light electronic adjustment does not function, what type of control is used (pnuematic, vacumm or direct), what is the control circuit and where are the control units physically located and how do I get to them?
Rtcasper Clarification Request; It is the electrical adjustment (Thumb wheel Adj on facia panel) that is not functioning not the mechanical adjustment on the head lights (Plastic cross head screw adjust L/R and U/D). The thumb wheel is usually a potentiometre adjusting a control voltage applied to the head light motor. On the Merc I can't see the motor and wonder if vertical head light adjustment is vacumme operated, where the vacumme pump is located or where i can get access to the wire loom to trace it though as I don't see how to get behind the facia. ANy suggestions as to how to get to and proove which bits are working? At the moment the headlights are adjusted to point correctly by the mechanical adjustment but this does not enable me to lower the lamps easily when I put a load in the boot.
Posted on Nov 16, 2008
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Posted on Jan 02, 2017
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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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