wipers wont shut on 2006 Volkswagen Golf TDI

wipers run for no reason dont have a rain sensor, but i can get them to stop when i turn on and off the rear wiper. any ideas?

had the same problem on my 06 tdi. turns out the problem was water leaking in through the rear window wiper. the water would run into where the wiper motor is and that caused the wipers to come on. resealed the area around the wiper and problem solved. its been over an year