I had the same problem on my SL. Make sure the hazzard flasher button is in the off position. That worked for me. Hope this helps.

__________________
Donwo
1999 SL 500 Sport (30K miles)
1998 E320 (SOLD)
1989 560SL (SOLD)
1987 300E (TOTALED)
1986 300E (SOLD)
1984 300SD (SOLD)