Fuse has probably blown. Your fuse box is located under the steering wheel, there's a little panel that just pops off and you will find the fuse box. There's 3 sets of fuses (left, centre, right). The centre set top row 2nd in from the left, that is the window wiper fuse (15Amp). If it has gone you should clearly see where the metal has burnt away in the middle. Replace it and should be Happy Days. Hope this helps you.
Olly, February 2009