It is likely that the MKIV is coded for the monochrome "Business" nav system. This uses a simple four-line display on an in-dash radio. It will not display to a LCD screen in that configuration. You can get NavCoder and recode the MKIV for your "Professional" system.
Here is a thread that tells you a little more about it. But, it is old, so we have since figured out how to correct the problem.
http://www.xoutpost.com/electronics/...rome-mkiv.html
Here is another thread with a number of posts about the eventual fix using NavCoder.
http://www.xoutpost.com/electronics/...te-screen.html
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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
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