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What's the part number for the MkIV? Are you sure it's good?
It's a simple plug-n-play swap, so if the nav system isn't coming up then you either have a bad nav drive or an incompatible nav drive. Keep in mind that the 3 series has a version of the MkIV that works with a much smaller monochrome screen, and it is not compatible with vehicles with the color 16:9 screen.
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