This has just started happening. When I engage the rear wiper, instead of returning to its park position on the right, it stops on the left.
After the normal pause it then returns to its park position. If I engage the wash, it operates normally. I had the washer unclogged by the dealer when I had it serviced a couple of weeks ago, but I can’t see how that would be connected to the problem.

Any ideas people? 

So it does one sweep over and stays on the opposite side? Then sweeps back the next time it needs to?