Hey Simon,
I have a 2007 X500 that I haven't had long. But maybe I can help a little. I found that I had to turn the wheel hard to the left if I wanted the key to turn counter clockwise to unlock the seat. Also, when you hook up the battery charger, you need to close the seat so the cargo light goes off. Will not charge with cargo light on. Hope that helps some. If i'm wrong, someone pease help us out. More info we can share the better. youall please ride safe, Kymcorider