My headlights stopped the "normal" start-up check some time back... they no longer dip up, then down when first turned on.

I've searched quite a bit but haven't determined what I should do next.
-Car is a 2003 X5 3.0 with March 2003 build date.
-factory Xenons
-I had the right CV replaced while on a road trip some 4 months ago...not sure if this is when the problem started

My Questions:
1. is there a specific fuse(s) for the headlamp assembley, motors and the level sensor? don't see one on the fusebox map? Only see the LCM
2. is there a proven way to check the level sensor's functionality
3. does the level sensor require calibration? can it be reset? and I saw a thread that mentioned "adjusting" its position on the arm??? Can someone elaborate on this procedure?
4. is there a way to rule out the adjusting motors? I'm assuming they're not at fault as they'd have to have failed together...but I'd like to verify this

Thanks in advance all!