try the relay had this problem before on a mate's car
grant, May 2010
more likely to be crank arm on motor needs re-positioning if blades stop in same position every time,[ if not then could be faulty park switch in motor]
", May 2010
do they stop in same position every time ? has wiper arms been off and replaced with out wiper being run and stopped with ignition on ,
and thanks for compliment