No luck with any of the parking sensor wires on the ones I checked. I am stumped. I found this post by TerminatorX5 where he says he used pin 6 on the middle PDC connector, but that was on his 4.6is. On my 4.8is, that wire is brown with a black stripe, which I believe is ground.

http://www.xoutpost.com/884883-post50.html

Maybe he can chime in and confirm.

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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