My sunroof would not always close after tilting it up. Sometimes I would have to turn car off, restart and most of the times it closed Or I had to keep playing with the button until it closed. Did the the "Re-Intialize" (holding button up) many times to no success, it would cycle through fine but then sporadically error. I would get an OBC error code saying "sunroof switch sporadic errors".
Its and $80 part and figured it was broken anyway - so attempted to take it apart, (and fixed it in the process).
My part number: 61 31 6 907 288
1. found instruction on net to remove button
2. the top button pulls straight off, small screwdriver and a little force
3.You will see 2 clips on each side to push the black cover off - I broke 2 of the 4 clips but it still held together when put back together.
4. the white slide has 2 tabs on each side that ride on a track.
5. track off with spring ball bearing
6. with the slide off, there are 2 white pieces that side in to keep the board down.

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2004, X5, 3.0, 202k+