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 Front Wiper Motor Module. The duration of the relay interval is determined by the Pulse Delay Resistance in the Front Pulse Wiper/Washer Switch.

LOW SPEED
In the LO position, the Front Pulse Wiper/Washer Switch supplies controlled voltage to the BRN (96) wire and to the Solid State Logic. The Solid State Logic circuitry provides ground to the Park/Run Relay which is energized and supplies voltage to the brushes of the Wiper Motor. The Wipers run at low speed until they are turned off.

HIGH SPEED
With the Front Pulse Wiper/Washer Switch in the HI position, battery voltage is supplied from the PPL (92) wire directly to a second armature terminal of the Wiper Motor. The Wipers run at high speed. When the Front Pulse 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 Wiper Motor 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 Front Pulse Wiper/Washer Switch in PULSE (Delay), a controlled voltage Passes through a resistance is applied to the BRN (96) wire, the Front Wiper Motor and Module and the Solid State Logic Board. Voltage is supplied to the Park/Run Relay Coil which is momentarily grounded by the Solid State Logic circuitry and the relay closes. Battery voltage is supplied through the closed contacts of the relay to run the Wiper Motor. 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 Solid State Logic Board grounds the Park/Relay Coil to start another sweep. The delay time between sweeps is controlled by the pulse delay resistors inside the Front Pulse Wiper/Washer Switch. The delay can be adjusted from 0 to 43 seconds.

WASHER (PULSE WIPER)
When the Washer Switch is depressed, voltage is supplied to the Solid State Logic Board. The Control Board supplies battery voltage to the Front Windshield Washer Pump through the PNK (94) wire. It also starts the Wiper Cycle through the low speed brushes of the Wiper Motor. The washer continues to run as long as the switch is held down. The Solid State Logic 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 Wiper Motor 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.