I'd check the bulbs in your lights. Somtimes bulbs look the same but when you replace one with a non-original look-a-like it can cause problems. My cruise control stopped working my W201 beacuse of a wrong bulb. You may have a ground/wiring issue. I'm sure one of the boys will have some more suggestions for you.

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