In addition to the features of a conventional (non-pulse) wiper system (mist, low, and high speeds), the pulse-type windshield wiper/washer 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 resistor in the wiper/washer switch assembly.

When the wiper switch is turned off, the wiper motor returns the wipers to the end of sweep (inner wipe) position and then reverses, activating its external depressed-park mechanism to lower the wipers to the park position.

With the wiper switch in DELAY (pulse), battery voltage is applied to the wiper motor connector at terminal B through circuit 243. Voltage also is applied to terminal D through circuit 113, and terminal E through circuit 112.

The length of the delay time between sweeps is controlled by the variable-pulse delay resistor. The delay is adjustable from 1-22 seconds.

In the LO position of the wiper switch, battery voltage is applied to the wiper motor connector at terminal B through circuit 243, terminal E through circuit 112, and terminal D through circuit 113.

The circuit board supplies power to the wiper motor, which runs continuously through the low-speed relay.

In the HI position of the wiper switch, battery voltage is applied at terminals B, C, and E of the wiper motor assembly through circuits 243, 92, and 112. Voltage also is applied to terminal D through circuit 113.

When turned to OFF from any position, the wipers complete the last sweep and park. When the wiper switch is in the OFF position, the wiper motor assembly has battery voltage applied to terminal B only, from circuit 243. When the end-of-sweep switch opens, the control circuit reverses the wiper motor which activates the external depressed-park mechanism. The wiper motor continues to run until the park switch opens.

When the washer switch is turned to ON, battery voltage is applied to terminal D of the wiper motor assembly through circuit 113. The wiper motor has voltage applied through the low-speed relay and operates at low speed for 2 to 4 wipes after the washer switch is released. The washer switch also applies voltage to terminal E which turns on the washer pump through circuit 228. The wiper motor has voltage applied through the low-speed relay and operates at low speed for 2 to 4 wipes after the washer switch is released.

When the washer switch is held on, the wiper motor circuit board keeps the washer pump on only as long as the washer switch is held on.

If the wipers had been in DELAY, LO , or HI, they would return to that operation after the wash cycle. If moved to the OFF position, they then return to the park position after 2 to 4 wipes.

When the wiper switch is moved to MIST and released, the wipers make one sweep at low speed and return to the park position. If the wiper switch is held in the MIST position, the wipers continue to operate until the switch is released. The circuit operation is the same as that of low speed.