I think that for older (2007-2008) X5's, you are better off buying the
BlackBerry Remote Stereo Gateway - Bluetooth audio adapter (its ~30-50 bucks)


that plugs into the Aux input, and is powered by the power socket in the arm console.

Cheaper and more intuitive way to control the Ipod, and you can use Pandora, movie streaming, etc. The Ipod software of the older X5;s is slow and blows.