I have a 2007 X5 with 3rd row seating and the button for the vent between the 2 seats does not work / light up. Anyone have 3rd seating and have I missed something in getting this vent to work?

Appreciate your help.

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2016 35i M Sport on the way
2007 4.8L Premium, Sport, Technology, Cold Weather and Rear Climate Package with Rear DVD, 3rd Row and 223m V Spoke Rims
2005 325 Ci
2000 323 Cic