Circuit Operation

WIPERS (PULSE)
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 pulse delay resistance in the Windshield Wiper/Washer Switch.

LOW SPEED
In the LO position, the Wiper/Washer Switch supplies battery voltage to the BRN (96) wire and the Pulse/Speed/Wash Control. The Pulse/Speed/Wash Control provides ground to the Park/Run Relay which is energized and supplies battery voltage to the brushes of the Windshield Wiper Motor Module. The wipers run at low speed until they are turned off.

HIGH SPEED
With the Windshield Wiper/Washer Switch in the HI position, battery voltage is supplied from the PPL (92) wire directly to a second armature terminal of the Windshield Wiper Motor Module. The Wipers run at high speed. When the Windshield Wiper/Washer Switch is turned to OFF, the wipers complete the last sweep at low speed and park.

PARK
When the wipers are turned off, the Windshield Wiper Motor Module runs at low speed until the Wiper Blades reach the PARK position. At that time the Park/Run Relay opens and shunts the Wiper Motor to stop it immediately. The Wiper Blades remain in the PARK position.

MIST
When the control is moved to MIST and released, the Wipers make one sweep at low speed and return to PARK. The Circuit Operation is the same as low speed.

PULSE
With the Windshield Wiper/Washer Switch in PULSE (Delay), Voltage is applied to the BRN (96) wire, the Windshield Wiper Motor Module and the solid-state control board. Battery voltage is supplied to the Park/Run Relay Coil which is momentarily grounded by the Pulse/Speed/Wash Control circuit and the relay closes. Battery voltage is supplied through the closed contacts of the relay to run the Windshield Wiper Motor Module. The relay remains energized as long as the contacts of the Park/Run Switch remain closed. When the wiper blades have reached PARK, the Park/Run Switch opens, de-energizing the Park/Run Relay. The wiper blades remain in PARK until the control board grounds the Park/Relay Coil to start another sweep. The delay time between sweeps is controlled by the pulse delay resistors. The delay can be adjusted from 0 to 43 seconds.

WASHER (PULSE WIPER)
When the Windshield Wiper/Washer Switch is depressed, voltage is supplied to the solid-state control board. The control board supplies battery voltage to the Windshield Washer Motor pump through the RED (228) wire. It also starts the wiper cycle through the low speed brushes of the Windshield Wiper Motor Module. The washer continues to run as long as the switch is held down. The solid-state control board keeps the wipers on for approximately six seconds after the washer goes off. If the washer is switched on during the PULSE operation, the wipers run in low speed for six seconds. The wash cycle is completed before the wipers return to the delayed pulse operation.

The Windshield Wiper Motor Module is equipped with a circuit breaker which protects the motor when the wipers are blocked. The resulting high current will open the circuit breaker which will reset upon cooling.