With Pulse

Wiring Diagram:

In addition to the features of a conventional (non-pulse) wiper/washer system (low and high speeds),the pulse system includes an operating mode in which the wipers make single sweeps with an adjustable time interval between sweeps The time interval is controlled by a solid-state timer in the wiper motor cover assembly. The duration of the delay interval is determined by the delay rheostat in the wiper/washer switch assembly.

The wiper motor is protected by a circuit breaker. If the wipers are blocked (by snow or ice, for example), the circuit breaker will open the circuit. The circuit breaker resets automatically when it cools.


With the wiper switch in "DELAY" (pulse), battery voltage is applied to the wiper motor 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 resistor in the wiper/washer switch assembly. The battery voltage at terminal "B" energizes the park switch coil, which closes its contacts. In response to the voltage at terminal "F," the solid-state timer momentarily closes contact "A." This applies battery voltage at terminal "B" to the contacts of the park switch to start the wiper motor.

A mechanical arm (end of sweep input) 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 resistor. The delay is adjustable from 0 to 25 seconds.