[wynb]

Do they work on manual? Fuse 17 in engine fusebox supplies wipers via a built in relay but its complicated as this relay switches to earth somehow activating the wipers.
Check for water ingress into the fusebox. Access the motor and wiggle the connecting plug with ign and wipers switched on. If no luck disconnect and re-connect, then check with a multimeter or test lamp check you have a switched live, a permanent live and an earth in the plug. After that its time to try a replacement motor there are probably loads on ebay.

 

[wynb]

You won't see the relay, its tiny and built into the fuseboard as its part of the CAN network. They can be replaced I think if you are handy with a soldering iron but I doubt that its at fault.