Did you put in Mercedes bulbs or the proper aftermarket bulbs? Some bulbs will fit and look the same, but are not the right ones. Make sure you have the right ones. I put in the wrong bulb once in my W201 and the cruise control stopped working. When I put i the oem bulb, it worked fine.

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1989 300CE Astralsilber/Schwarz
1992 300CE Schwarz/Schwarz