The front wiper motor and the wiper transmission mechanism (linkage) are installed below the windshield, under the cowl panel cover. How the wiper system works: when you turn the wiper on, the wiper switch sends the signal to the control module. The control module operates the wiper relay. The relay sends 12-volt power to the wiper motor. If the wiper blades skate over water on the windscreen, the probable cause is a faulty wiper arm. Fit a new arm. Oil the hinge pin on the wiper arm every time the car is serviced. A seized hinge pin prevents the springs from pressing the arm hard on to the windscreen, and the blade may skate over it.