Originally Posted by va335i
OK I guess I will trace the wires this weekend. Now I am really curious as what it is. Like I said It was one owner car with CPO when I bought it. It has factory fogs and I do not see anything extra when compared to other 335i that are the same year. I don't think it could be for aftermarket stereo since it has Idrive.
You said you bought it CPO? Take it to the dealer.
My thoughts, it kills the license plate lights.