I wanted to put new wiper blades on my base model 2006 cayenne so I put the wipers in service mode as per internet instructions. ",key on , key off , depress wiper switch 1 for " guick wipe" and they went to the center of the windshield just as they should. Key in. key off flick the switch ,NOTHING@!!!! Now they are stuck right in my vision path and don't move. HELP PLEASE+++++++