The inner lights come on when your turning if they where on the car when it was built but if they where retrofitted they don't they come on as main beam because that's where it is on the halogen lights.
But if you connect the wiring up for the shutter the dipped beam moves and you get your bi xenon.
Here is the explanation.
http://www.e90post.com/forums/showthread.php?t=28035