If you have the CD drive back there, you definitely have navigation. So, I am guessing that the unit is dead. The MKIV will probably fix it and make your navigation life wonderful.

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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