The car is too early for Aux. I don't think that the aux wiring is there until late 2002 builds. Plus, the radio in a 2001 definitely won't support aux.

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SOLD
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