Front Screen Wiper and Washer Circuit Operation

Front Screen Wiper and Washer Circuit Operation

The system is operated by the multi position wiper switch, which is located on the right side of the steering column.
All functions of the switch and circuit are explained in the following paragraphs.

Wash Wipe Function (Timed)
With the ignition switched ON, power is supplied via Fuse C5 to the multiposition switch 4, control unit 5, and park switch 9 which is driven by the wiper motor 8.





Momentary depression of switch 4 connects power supply at terminal (8) to terminal (6) causing washer pump 6 to operate for as long as switch 4 is depressed. Depression of switch 4 will also energize the relay inside of control unit 5 which powers the wiper motor 8 via terminals (4) and (9). The ground for the relay windings in control unit 5 is timed to allow the wipers to make three return sweeps of the screen before parking. The timed cycle begins at the moment switch 4 is released.

Manual Wiper Function (A)





Lifting the lever towards the driver causes the wipers to operate for as many sweeps as required, parking when the switch is released.

Intermittent Variable Delay Wiper Function (B)


Moving switch 4 downwards as seen in the above image, to the intermittent variable delay wiper function, causes the wipers to perform one sweep of the screen with a time delay. The time between each sweep of the screen is adjusted by the rheostat in the switch lever.

Continuous Slow Speed Function (C)





When the lever is moved upwards to the first position, the wipers are caused to operate continuously at slow speed.

Continuous Fast Speed Function (D)

When the lever is moved fully upwards the wipers operate continuouly at fast speed.