It doesn't say in that diagram what those wires are for. Just than its 3 positive and 3 negative. So in theory the 3 positive could go together to any positive 12 volt connection and the 3 negative wires can go together to a negative source. That's the only thing I can even remotely determine from the diagram. I cant really give you a straight answer since I don't know and I don't want to be responsible for messing up something on your X5.

__________________
Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
More are at my website

Aftermarket E53 Radio Install