Hi, ive just purchased a 91 535i e34 right hand drive and underneath the windscreen there is a plastic mesh trim where the wipers sit.underneath this there are 2 round plugs that are clipped to the body of the car (a black plug and a white plug).To get my hand down to the plug i had to remove the 4 phillips screws holding a plastic cover down over the computers on the right hand side near the firewall. My white plug that had 2 blue wires and 2 redish brown wires (if i remember correctly) was unplugged. I have no idea what this plug does??Does anyone have any answers?