What is causing my 2004 Subaru Impreza rear wiper to stop off the home position? Is there a relay?

Question

The wiper should be intermittant but now it wipes continuously until it is shut off. When it stops, it will stop any where. I have inspected the motor and the internal switches and they are fine. The dealer suggested that the wiper switch on the steering column is faulty, but I don't buy it. There must be a relay somewhere which creates the intermittant action. I believe that this is stuck closed, but I can't find any relay!

Answer 1

It should be under warranty, depending on the mileage. Rear wiper transmission is probably sticking or the nut is loose.

Answer 2

There is a circuit board in the combi-dealer may be correct on this.