I was having issues with my passenger side window not working. Thought I was going to have to spend money to get it fixed. Found this solution on another message board (mini2.com). I thought I would share the solution. I couldn't believe it, it actually worked
Solution:1. With the car in aux or on -- sit in the passenger seat with the door open.
2. Press and hold the window switch up
3. Immediately, while holding the window up toggle -- with your fist -- punch / hit three inches above the large speaker -- three times. <bang bang bang>. Don't be easy on your MINI.
4. Let go of the toggle switch.
5. Press and hold the toggle switch up for 5 seconds.
6. Lower the window completely.
7.With the door still open, raise the window completely. The window should have now "re-indexed" itself.