Do you flashers work? You should here a clicking sound from the ash tray area. The relay is behind it. It's real easy to get to it. Pull the ashtray out, then unscrew the bracket that holds the ashtray. It's tucked down inside.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member