Originally Posted by UCrewX5

The reason this isn't working for you is the AUX only works with 2003 and newer radio modules. If you look at the first page on this document - http://www.bmwmotorsports.org/pdf/E3...nstallInst.pdf - it says that this kit is for X5's from 10/02 production and beyond, which is the 2003 model year.

Sorry to be the bearer of bad news.

:xoutpost:

p.s. you can install a radio module from a 2003 or newer and this will allow you to have AUX. That's what I did on my 2001 X5 and it works great.