Agree with Mfiver- the install is very straightforward. But I can't tell you how many times I've been told that "you can't wire a controller in an X5" by dealers and online hitch suppliers. Even etrailer.com told me that and they're pretty big. I sent him a pic of the plug on the Light Control Module and the instructions to wire into it and they were quite grateful.

One caveat though- in my case on my '04 4.4, my plug had more pins in it that the pics and diagrams posted on here, and none are blank. No big deal, I just used my circuit tester to find the correct pin and spliced the wire from my Prodigy to the correct wire, then ran the blue wire to the rear of the car and connected to the hitch wiring box in the spare tire well. Works like a charm. I frankly think this installation is easier than most vehicles because of the factory pieces used for the hitch installation.

BTW- the Prodigy is so much better than my old Activator in the speed with which it activates the trailer brakes. State of the art. The hardest part of the entire installation was deciding where to mount the controller.

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'04 E53, 4.4 Sport
'97 E39 528i
'86 911 Carrera, track car
'96 BMW R1100R