I've got a 57 plate A3, and there's 2 little buttons near the steering wheel. They are the opposite side to where the dial is for the lights (behind where the indicator stalk is) there's 2 round buttons with l and r on them (so left and right) and you can press them to the left for I and right for II. And if they are central then they are off. I have absolutely no idea what they're for and can't find anything in the manual or online. Any ideas??