A friend of mine replaced the wipers assembly on his a3 8p 1,9 tdi today with second hand one because his stopped working (new is like half the price of the car).The "new" wipers behave odd.When you push the lever down to move them manually they are working fine but if you put the lever up to auto (intervals) move after they start to go fully backdown and the end the go a few centimeters up and stop.The next cycle the go down and right in the end they start to move jittery like.The next cycle is like the first one and so on ...So where is the problem ? We didn't plug the car to scan it because it's raining and it's dark but tomorrow i will scan the car with VCDS.I think the ECU is a swiming in water but that is only a guess.