Same thing happened to me, but washers also affected.
Fuses etc & articulation OK. Local man used diagnostic -ECU in control stalk dud. He had to send car onto main dealer for software re-programming with new stalk. Total cost £410
This is b****y ridiculous. Why does a wiper need and ECU. If I couldn't afford to have it done I have a useless car on my hands!
Harry Forder
January 2011