Ummm here, I guess:

Pos 1 - Parking lights, DRL's go off, halos come on as well as the the signal lamps (in the states at least)
Pos 2 - Full low beams come on, halos stay lit, so do signal lamps.

The high-beam (closest to the inside) non Xenon bulbs (as you have bi-xenons on a X5 starting in 2004) they are the DRL's the halos are entirely different so messing with the halo bulbs will not effect the high-beams.

I don't know why you would want to disable the halo's as it sounds like much more trouble then it is worth. You should take a picture of your car and circle the part you mean.

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