Wiper and Washer Systems: Description and Operation

The Interval Wiper/Washer System is powered by the 15A WIPER fuse of the Interior Fuse Panel which is hot in the RUN position. The System can be operated in three speeds: Lo-speed, Hi-speed and Interval wipe.

Wiper Operation

When the Interval Wiper/Washer Switch is put into the LO-speed position, the Wiper Switch powers the interval override input of the Interval Governor so that the electronic switch and Governor Relay are pulled close. Current will then flow from the WIPER fuse through the closed contacts of the Governor Relay to the LO-speed lead of the Wiper Motor. With the Wiper Switch in HI-speed, current flows from the WIPER fuse directly to the HI-speed lead of the Wiper Motor.

Interval Wiper Operation

When the Interval Wiper/Washer Switch is put into the INT position, the Wiper Switch powers the interval timer and the electronic switch momentarily closes allowing current to flow to the LO-speed lead of the Wiper Motor. As the Wiper Motor moves out of the grounded PARK position, current still flows to the motor. Once this wiper returns to the PARK position, it waits for the interval timer to end the delay and energize the electronic switch again. The length of the delay is dependant on the position of the interval adjust.

Washer Operation

When the Washer Switch is activated, current flows from the WIPER fuse through the closed Washer Switch to the interval override of the Interval Governor and the Washer Pump Motor allowing washer operation to proceed.

Park Operation

As the Wiper Motor turns, the Wiper Motor Switch moves from the grounded PARK position to the RUN position. The powered RUN position allows the Wiper Motor to run until it reaches PARK. This prevents the wiper from stopping anywhere but the PARK position when the Wiper Switch is turned off.