Keafer,

Whats the build date on your X??
The standard rule of thumb had been that you had to have a 3-04 build or later to install the 05 TCU and have BT and Assist. The attached TSB seems to contradict this a bit.

I have a 3-04 (early production)with Nav and assist and all that was needed is the TCU, BT antenna and its connector cable, thats it. You've got to get it coded.

It looks like the late production 04's have the BT antenna already installed.

This new TSB is perfect, i wish i'd had it when i did mine a couple of months ago.

http://www.alldata.com/tsb/BMW/11255...405/index.html

Good luck..........