Brian and SlX5,
Thanks for the update. The wiring issue is actually from BMW itself. This is part of the SIB for the later models that can have the TCU replaced. I am really considering going with this option. The TCU is about $350 which is a lot cheaper than the ULF. I am nervous that if I can't get it to work in my car, I will be taking a loss in reselling the TCU and still have to end up with a ULF. None of the vendors will accept a return on the TCU. There are also previous threads on this forum where people have attempted to do this retrofit with the earlier 2004 X5 that came with the TCU that had a bluetooth passcode but no bluetooth

__________________
Abster641