Windshield Wiper/Washer System Pulse Operation

With the wiper switch in "DELAY" (pulse), battery voltage is applied to the wiper motor cover assembly at terminal "B" of connector C1 through the GRY wire. Voltage also is applied to terminal "F" through the PNK wire and the pulse delay resistance in the wiper/washer switch assembly. The battery voltage at terminal "B" energizes the park switch, which closes its contacts. In response to the voltage at terminal "F," the solid-state timer momentarily closes contact "A," which applies battery voltage at terminal "B" to the contacts of the park switch to start the wiper motor.

A cam operates contacts in the wiper motor cover assembly, which causes contact "A" to open when the wipers have completed their sweep. Since the park switch coil remains energized, the wipers do not park but remain just above park position until cover assembly circuitry closes contact "A" again to start another sweep.

The length of delay time between sweeps is controlled by the pulse delay rheostat. The delay is adjustable from 0 to 25 seconds.