The stalk the rear wash wipe is on. I think left one is broken needs replaced get one from breakers as there expensive new thats the only switch for that circut that could cause that fault you need to disconnect it from motor till you get a new one as the motor will burn out hope that helps
Currently in DazD01's garage: 2010 megane rs 2007 clio rs team f1 and 1990 r5 gt raider