Opening the boot will turn the nav on.

Try opening the boot, and leave it open for a few minutes while you watch the nav. With the boot open, doors closed, and key out of the ignition, the nav should turn back off within a couple of minutes.

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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