In it's original form, the kit consisted of two things:
--The alternate center dash with the Garmin mounting ball and a wiring harness with open wires at one end (to patch into your car radio's wiring harness, for power only) & a plug at the other ( to mate with the NAVI's wiring harness once you've assembled it. ).
-- The BMW branded Garmin NAVI, with it's cradle, and a wiring harness with open wires at one end ( to pass through the garmin ball, and then you would insert those open wires into a plug header and mate it to the other harness, mentioned above...) and a ( i think it was...) a mini usb connector to plug into the NAVI.
The only thing this setup got you, was super clean passage of the wires from the NAVI to the car, via the garmin ball mount. The down side is, if you looked carefully, there was no provition to patch in NAVI audio into the X3 radio.... only power was provided.
Also, when I went after the whole kit, the BMW branded Garmin NAVI was no longer available.
So.. I just got the center dash and improvised, by Dremeling a small hole into it ( in a location that's hidden by the 3790T's cradle ) and using rubber grommets to fill in the gap.
Also, with the 3790T traffic info is received via the power cable, so splicing it to pass the wires through the garmin ball mount, would risky.
Going this route, a cigaretter lighter socket with an in-line fuse and open wires at the other end, such that you can patch it into the electrical system at the radio harness is the best option.
I have gone back in there to improve the setup...
The NAVI power plug and the cigarette lighter socket tend to seperate over time, due to vibration from driving. Using a thick rubber band to keep them together, solves this problem.
Also, I unbundled the power cable and passed it through an open to the passenger's side of the center dash area. I now receive traffic info nicely.
I've recently noticed that BMW has updated the portable navigation option to what looks like a Garmin 3790T. And they never stopped selling the alternate center dash w/ the garmin ball mount.
I haven't had the opportunity to check to see if they now allow audio patching into the car radio.... that would be cool.
Hope this info helps!
