Couple of questions
 

Ok, got a couple of questions. First, anyone know how to find the wire for the reverse lights on an '07 X3? I bought/installed the hitch and wiring kit from etrailers.com, but you have to buy the "fifth" pin wiring separately and wire it in. Since our reverse lights are on our back doors/hatch rather than with the rest of the lights, the wiring harness for them is separate. Ugh!
Second, a few times now when I've turned my car off and headed into the house, I've been able to hear this noise coming from somewhere in the back - kinda like underneath the floorpan. It sounds as if there is still some kind of motor/fan running...anyone know what that could be? Thanks in advance!
Tony