Hi
I am in the process of upgrading my 04/02 E39 M5 to bluetooth.
I have a Motorola V50 in the armrest at the moment.
Thanks to the threads here I have purchased a (Euro) TCU (84.10.6.978.533) from ebay (new), a bluetooth antenna (84506928461) (£15) and a centre armrest oddments tray (51168215943) (£10) from a BMW dealer.
I believe that is all I need (my harness already has a 52pin connector).
Oh, I bought Navcoder and a USB thingy to make it work too.
Anyway today I started dismantling the car. I took lots of pics and will write a how to when it is all finished.
My (first) question is
Which Fakra cable do I use for the bluetooth antenna (I intend to put it under the armrest)
There are four in the trunk area:

One black/purple one marked 'GSM'. I presume that goes to the aerial, as it was plugged into the aerial side of the compensator.
One black/purple one with no markings. This one was connected to the 'phone' side of the compensator, so I presume goes to the centre arm rest.
One cream/purple one marked 'WDCT'. Loose.
One cream/purple marked 'U01464 F MDE'.

Onder the armrest there are two Fakra cables. Both Black & purple.
Any ideas?
Thanks

UPDATE 17th May 2010. See page 4 - http://www.xoutpost.com/741860-post32.html - for an update!