Yep I have been looking at the online WDS. It doesn't seem to show all the wires. For example I don't see the radio hot wire. It seems to show wires for all the speaker connections. I'll double check it to be sure.

I'll probably have to bite the bullet and start taking that center console apart so that I can follow the wires. Oh what fun. You wouldn't happen to know the part number for the radio wire harness would you [if there is one]?

I do have the aux cable. It is working fine. I was able to play the aftermarket system through it. I couldn't detect any issues with the sound quality.

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[Sold] 2004 X5 4.4i - Sterling Gray - Truffle Brown, Sport, Preminum, Rear Climate, DSP, Sirius, PDC, 132's (19 inch wheel), Comfort Seats
Dynavin, JL Audio Stealthbox, Alpine PDX-5 Amp