It should be under the dash, above and to the left of the brake pedal. The key/headlight buzzer is on the same bracket, so if nothing else, remove lower dash panel, put keyin ignition with door open, you'll find it fast. Easy replacement. I've got a spare I think is good if you can't get another, will entertain offers. Good luck.

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Earl McLain
'02 C230 Kompressor
'89 560 SEL "Frau BlueCar" (retired April 2004)