My experience with the Eonon unit designed for an E46 is that the only steering wheel buttons that will work are volume and the up down buttons and I think the "Talking Head" guy will cycle through the different head unit modes (Aux, SD Card, etc.)

Mike

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Mike
Dallas, TX & Appleton, WI
2003 E53 4.4i Pearl Beige
2003 E46 330Xi Monaco Blue
2007 E90 335Xi Black Sapphire Metallic
2011 F25 X3 28i Black Sapphire Metallic