It is located in the rear on the driver's side behind the same removable side panel covering the Nav module, CD changer, DSP, etc. It is the silver rectangular box mounted to the DSP unit. Look at this video and you will see what it looks like.

YouTube - installing the BMW bluetooth module in a 2000 E39 M5

I first removed a small section of the flooring by removing three screws. This exposed the BT module. I next removed the mounting screws which allowed be to pull the BT module out. I then removed the two single wires connected to the end of the BT module that is visible when installed. I then removed the harness connector, waited a couple minutes, and reinstalled everything. Good luck.

Thanks again, mug3. I'll give that a try.
Zachthefcr

Did it work? I will try it on mine. My iphone doesnt see it, I have a 2004 X5.

try to remove all four fuses in the trunk on the right side that say phone !!

this happenns to mine every 2-3 mo's and i just pull fuses and its good !!

The assist/BT module in the 2004 X5 doesn't have BT operational. The only way to make it work is to replace the module with a newer unit.

Ucrewx5,
Is it just the tcu ubit bad plug and play? or I have to get various parts? I keep reading mixed messages from differenet forums. If I do replace it, does it have to be recoded at a dealer?
Tnx!!!

oops, that message read wrong,
Ucrewx5,
Is it just the tcu unit and then plug and play? or I have to get various parts? I keep reading mixed messages from differenet posts. If I do replace it, does it have to be recoded at a dealer?
Tnx!!!

See http://www.xoutpost.com/articles/all...04-bmw-x5.html