Wiper

When the Pulse Wiper/Washer Switch is in LO, battery voltage is supplied through the GRA wire directly to the low speed brushes of the Wiper Motor. The Wiper Motor runs at low speed.

When the Pulse Wiper/Washer Switch is in HI, battery voltage is supplied through the PPL (92) wire to the high speed brushes of the Wiper Motor. The motor operates at a higher speed.

The Park Switch is open only when the wiper blades are in the PARK position. In all other positions, the Park Switch is closed. When the Pulse Wiper/Washer Switch is moved to OFF, battery voltage at the WHT (93) wire is supplied through the Park Switch, the Pulse Wiper/Washer Switch and the GRA (91) wire to the low speed brushes of the Wiper Motor. The Wiper Motor continues to run at low speed until the wiper blades reach the PARK position. At that time, the Park Switch opens and stops the Wiper Motor.

The Wiper Motor is protected by a circuit breaker which opens if the current through the Motor rises to a high level. This may happen if the wiper blades are blocked by ice or snow. The circuit breaker resets automatically after it cools OFF.

The pulse-type Wiper/Washer system includes an operating mode in which the wipers make single strokes with an adjustable time interval between strokes. The time interval is controlled by a Solid-State Pulse/Speed/Wash Control in the Windshield Wiper Motor Module. The duration of the relay interval is determined by the Delay Resistance in the Pulse Wiper/Washer Switch.