Windscreen Wipers: Notes

Fig 1: Windscreen Wipers Communication Diagram

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Windscreen Wipers Circuit Diagram (1 Of 3)

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 3: Windscreen Wipers Circuit Diagram (2 Of 3)

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 4: Windscreen Wipers Circuit Diagram (3 Of 3)

Courtesy of SAAB-SCANIA OF AMERICA, INC.

The windscreen wiper assembly is located under the cover beneath the windscreen.

The windscreen wipers are controlled by a changeover switch on the right-hand side of the steering column.

The assembly comprises a motor, two wiper arms and an arm linkage that converts motor rotation into wiper movement.

There is a built-in thermoswitch in the motor that trips if the control switch has been activated and the blades have jammed (frozen).

The wiper switch has three positions:

• Intermittent (J)
• Low speed
• High speed

There is a function in the intermittent position that enables the frequency of strokes to be regulated by a potentiometer. The wipers come on at an interval of 2--15 seconds depending on the setting selected. The potentiometer for the intermittent wiper controls the DICE control module which operates the wiper relay.