This post shows the pinouts of the two radio plugs.
http://www.xoutpost.com/articles/x5/s...formation.html

Also, BMW makes a set of adapter plugs that convert the old gen harness to the new gen radio. You can just buy these directly from a BMW dealer, and the radio update is plug-and-play

61.12-6 913 957 Main radio plug adapter
61.12-6 913 955 Old gen to new gen antenna adapter
61.12-6 924 785 New gen audio input converter
61.12-0 140 716 Analog CD changer audio cable (if needed)

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input