Windshield Wiper-Washer System

General Description

Fig 1: Wiper Motor:

Fig 2: Wiper-Washer Control Switch:

The Permanent Magnet (PM) Depressed Park windshield (w/s) wiper with remote washer pump system consists of a depressed park wiper motor and a remote washer pump mounted on the washer fluid container.

Based on the type of control switch used and whether an optional electronic printed circuit board is attached in the wiper cover, the system can serve as either a pulse type wiper-washer system or a standard type windshield wiper. Pulse timing and "demand" wash functions are controlled electronically on pulse windshield wipers.

Wiper and Washer Operation

Pulse Windshield Wiper System

Fig 3: Pulse Wiper Operation Chart:

Electronic logic circuits on a pulse wiper system's printed circuit board establish all timing and washer commands. When the WASH switch is pressed for less than one second, the washer sprays only during the wiper arm outwipe and pulsates operation for 2-1/2 seconds. Then the wiper dry wipes for nearly 6 seconds before shutting off. See Pulse Wiper Operation Chart, Fig 3, for a brief description of pulse wiper system operation.

Fig 4: WIS Wiper-Washer Circuit Diagrams:

If the WASH switch is pressed for more than one second, a (demand) wash is performed for as long as the switch is depressed. This wash action followed by 6 seconds of dry wipes before shut-off. With the control switch in the LO or HI speed position, the respective brush circuit (Fig 4) is completed to the (+) 12 volts DC source and the wiper motor runs at the particular speed setting.

Fig 6: Testing Standard W/S Wiper-Washer Switch:

Fig 7: Testing Pulse W/S Wiper-Washer Switch:

Fig 8: Wiper-Washer Switch Check Chart:

Moving the switch to the PULSE mode operates the wiper motor intermittently and the delay can be varied by moving the switch back and forth in the Delay Mode. An instantaneous wipe can be obtained by moving the switch to the MIST position. If the switch is pressed continually, a continuous wiping action will be performed. See fig 6, 7, and 8.