Wiper and Washer Systems: Description and Operation

SYSTEM

A two-speed intermittent windshield wiper motor is employed within this system. The intermittent operation is controlled by an adjustable pause between wipe cycles. The controls are located in a pod, attached to LH side of steering column.

FUNCTIONS

Intermittent wiper/washer circuit contains four major components, wiper switch, wiper module, wiper motor, and washer pump. The intermittent wiper washer is supplied with power from a fuse which supplies voltage to the wiper switch, washer switch and the module. The wiper operates by placing the wiper slide lever in HI, LO, INT or WASH positions.

NORMAL OPERATION

When the wiper switch is positioned on LO, current flows from the fuse block through the switch to the LO speed brush of the motor. When the wiper switch is positioned on HI, current flows from the fuse block through the switch to the HI speed brush of the motor.

INTERMITTENT OPERATION

When the wiper switch is turned to INT, current flows from the fuse block through the switch and then to the wiper module. The timer in the intermittent wiper module momentarily applies battery voltage to the LO speed brush of the wiper motor and the motor completes one wipe cycle. The time between wipes is controlled by a rheostat in the wiper switch.

PARK CYCLE

A PARK/WIPE switch in the motor gearbox is driven by the wiper motor. The switch provides battery voltage to the wiper module when the wiper switch slide lever is moved to the OFF position, so the the wiper system can complete the wipe cycle. The blades park in the lowest portion of the wipe pattern. During the last few degrees of travel the PARK/WIPE switch provides a ground to the wiper module.