Hi Hollywood,

My understanding is that if you have factory nav and use a cable such as this

http://www.ebay.com/itm/331280795197

you will go from the Eonon unit to the rear hatch floor with the cable to make the majority of the connections to the radio tuner box.

A couple of minor connections are still made in the front dash (dimmer circuit, running lights on, 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