Washer Operation

When the windshield washer switch is pushed (closed), current flows through the park switch coil to ground closing the park switch contacts. Current flows through the park switch contacts and wiper motor to ground. The wiper motor operates at low speed. Current also flows through the circuit board and the park switch coil to ground keeping the park switch contacts closed after the washer switch is released. The circuit board allows current to flow through the washer pump for 2 - 1/2 seconds after the washer switch is released, or for as long as the washer switch is held closed. The circuit board interrupts power to the park switch coil approximately 6 seconds after the washer switch is released. This turns off the wiper motor and the wiper arms to return to the park position.