I take it there is not a service mode for changing the wipers then, on other cars I have owned, where the wipers will not lift when in park you have a service mode that you put them in and the go half way up the windscreen allowing you to fully lift the arm to change the blades, even though it is still very easy to change the blades as mine only took 5 mins I would of thought they would have a service mode as well, I think next time I am at the Jag dealership I will ask the question.