I am curious as to how you replace the electrical part of the switch - there seems to be a major "10 pounds of chit in a 5 pound can" behind the dash of my 190!
Please post how you actually were able to get to it and replace it.
My 16v, put away for the winter, needs one, and I have one - same problem. Just no drive to go in there without some pointers!

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport