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there are several options for US/NTSC, so, I guess you tried them all... poor grounding usually results in "snow" on the picture, poor grounding results in external interference, say from the alternator, like sound whine, or alternator/engine speed related disturbance on the image.
it seems that you are missing a sync signal from the tuner - check for poor connection or no connections on the pins that go to TV module and the NAV - the "newly" installed harness... there is a pinout for the plugs on bimmernav . com, you can do a simple continuity test on the pins...
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