I ran into that on an eonon unit I have in my 323i. After ditching eonons stuff and doing the custom rom with all the toys I learned its a balancing game to get it all to work together correctly.

My experiences with it caused me to be very careful about customizing all the later units anymore than necessary.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
More are at my website

Aftermarket E53 Radio Install