Check the fuse for the wiper circuit, If this is ok then check the feed to the fuse. If you have a feed then check the feed to the motor, If there is a feed to the motor then chances are you have a faulty motor.
If there is no feed to the motor and the fuse is ok - you have a wiring fault or a computer fault (depenant on vechicle manufacturer/model)
Dazza, May 2009