Ok the PDC should shut off/turn on when you push the PDC button. That is how it works and if it does not then it is broken. I am not sure if I was the only one who's Aug deliver car had but the PDC w/ backup camera would not show a split screen with camera on 2/3 and the PDC image(front back sensors) on the other 1/3. I had them do an update for complaints and the newest version had it. The dealer should fix this.

This may help. Here is alist of all SIB's released for the X5
http://support.nanocustoms.com/bmw/

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2012 X5 50i ZAP(2VA, 336, 465), ZTP, ZPP, ZPS(6VC), ZCW, ZRC, 322, 4UB, 4NC, 610
2011 ///M3 Silverstone II
2011 X5 50i(lemon)
-- SOLD --
08 550 Msport
07 X5 4.8I sport
04 545i sport
02 4.4i sport
01 540I M/sport
00 SL500
97 SL500