Front Wiper and Washer Systems

In addition to the features of a conventional (non-pulse) Wiper System (mist, low and high speeds), 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 timer in the Windshield Wiper Motor Module. The duration of the delay interval is determined by the pulse delay resistor in the Windshield Wiper/Washer Switch Assembly.

The Park Switch gives wiper position information to the Wiper Motor Module. The Park Switch closes whenever the Wiper Motor begins operating and opens only when wipers are in "PARK" position.


PULSE OPERATION

With the Wiper/Washer Switch in "PULSE," voltage is applied to the Windshield Wiper Motor Module at terminal "E" through CKT 91. Voltage is also applied to terminal "C" through CKT 93.

The variable resistance seen through the pulse delay resistor is used by the Wiper Motor Module to determine the delay time between sweeps.


LOW SPEED

In the "LO" position of the Wiper/Washer Switch, battery voltage is applied to the Wiper Motor Module at terminal "C" through CKT 93, with voltage for "LO" speed applied to terminal "E" through the 680 ohm resistor and CKT 91.

The Wiper Motor Module supplies power to the Wiper Motor, which runs continuously through the "LO" speed control coil.


HIGH SPEED

In the "HI" position of the Wiper/Washer Switch, battery voltage is applied at terminals "C", "D" and "E" of the Wiper Motor Module through CKTs 93, 92 and 91. The Wiper Motor Module supplies power to the Wiper Motor through the "HI" speed control coil to a separate armature brush for high speed operation.

OFF POSITION

When turned "OFF" from any position, the wipers complete the last sweep and park. When the Wiper/Washer Switch is in "OFF," the Wiper Motor Module has battery voltage applied to terminal "C" only, from CKT 93. The Wiper Motor Module supplies power to the Wiper Motor through the "LO" speed control coil until the Park Switch is opened, causing the Wiper Motor to stop.


WASHER OPERATION

When the Washer Switch is turned to "ON," battery voltage is applied to terminal "E" of the Wiper Motor Module through CKT 91. The Wiper Motor Module applies voltage to terminal "A" which turns "ON" the Washer Motor through CKT 94. The Wiper Motor has voltage applied through the "LO" speed control coil and operates at low speed.

When the Washer Switch is held "ON," the Wiper Motor Module will keep the Washer Motor "ON" only as long as the Washer Switch is held "ON."

If wipers had been in "PULSE," "LO" or "HI" they would return to that operation after the wash cycle. If not they then return to the "PARK" position.


MIST

When the Wiper/Washer Switch 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 that of low speed.