Without Pulse

When the wiper switch is in "LOW," battery voltage is applied to the park switch through circuit 96 and to the park switch contacts through circuit 196. The park switch closes its contacts, which supplies battery voltage to the wiper motor through circuit 196. The wiper motor operates at low speed.

When the wiper switch is moved to the "OFF" position, the park switch is de-energized. This causes the mechanism to shift the wipers toward the depressed park position. When the depressed-park position is reached, the park switch opens the wiper motor circuit, stopping the wipers.

With the wiper switch in "HIGH," battery voltage is applied directly to the wiper motor at terminal "A" without passing through the park switch contacts. Terminal "A" is connected to a separate wiper motor brush for high speed operation. The park switch coil remains energized in the "HIGH" position because of the voltage present at the low speed wiper motor brush when voltage is applied to the high speed brush. The current path from the low speed brush to the park switch coil is completed through the wiper/washer switch assembly.

The wiper motor is protected by a circuit breaker. The circuit breaker opens if the wipers are blocked (by ice on the windshield, for example). The circuit breaker resets automatically when it cools.