So I tried this yesterday, and when I tapped into pin #7 (brown/white) of the middle connector (black), the PDC light on the dash blinked rapidly and got pulses of power to the test LED I was using.

Could there have been changes to the 06 model year that would change the wire I need to use?

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2003 530i, Silver on Grey, BC Coilovers, Square 9.5" M-Parallels, Gloss Black Roof
2007 328i, Alpine White on Black, Sport/Nav/Premium
SOLD: 2006 X5 4.8is, Lemans Blue on Black