1996 s 10 blazer. 4 door. The rear wiper itself works just fine but when I push the wash button on the dash the washer pump doesnt kick in and the wiper doesnt go through its 3 or 4 strokes that it use to do when I would wash the back window. It does nothing. Is this the circuit board in the rear hatch attached to the motor? Could that be bad? Any help appreciated.

 

mine did the exact same thing and it ended up being that the washer flluid line was not hooked up to the sprayer. Take off the rear plastic and trace the line to the connection of the sprayer.