AKRY,
Thanks for the post. As I was removing the seats today I noticed the cable going into the drivers armrest and it also had the same type of insulating cover and plug. Didn't know this feature was on this car but now I know it does. Wonder why the former owner had a Nokia setup wired in if the car was factory prewired.
Thanks again,

Tobias MB
300CE, C280Sport, 400E, 190/5.0