I can't offer any information regarding your setup, I guess you could do as I did. I checked the wiring to the unit I wanted to relocate to see if it was duplicated in the rear. I presume the navigation unit has additional wiring, but I don't know. Good luck.

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Neil

2016 X5 3.0D
2009 X3 3.0D
2005 X5 3.0 Diesel Sport (sold)
2007 320i (sold)