I have a 1990 560 SEL, which I bought used, with no owner's manual. No problem, I've been a Mercedes driver for more than 20 years, so I figured out all the switches and buttons, except for one. If anyone can help, I would greatly appreciate it. The switch is located below the ashtray, between the two seat-heater switches. and it's an original Mercedes factory switch, but I have no idea what it's supposed to do. Please help....
-s