Why did'nt you use the camera on your goodies table, Milton - did it come with the HU?
Do you have cell bluetooth before this retrofit?
My 04 was wired for it but I had to find the ULF unit (I think thats what its called - the box in the back side panel that runs it).
And is the new head unit compatible with the bluetooth - show your calls coming in on the screen/phonebook?

Thanks for sharing all this!

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2004, X5, 3.0, 202k+