According to a certain DVD that starts with a W, ends with a S and has a D in the middle, the Yellow+Red and Yellow+Brown come from the radio, and the black+white and black+brown come from either the Telefone system, the Voice control or equivalent module.

WTF?

In the X3, I think I saw the telephone system injecting its sound somewhere into the radio. The X5 has a separate sound harness for both systems?!?!

__________________
My BMW: Photos