With Pulse

Circuit Operation

Whenever the ignition switch is in the "ON" or "START" position, battery voltage is applied through the wiper washer fuse to the Wiper/Washer Switch (in the combination switch) and the front wiper motor pawl and Switch contacts.


Washer Operation

When the Front Wiper Washer Switch is pulled toward the driver, battery voltage is applied through the Wash Switch contacts to the front washer pump. The front washer pump is permanently grounded at G101 and will operate as long as the Wash Switch is held. To initiate wiper operation, battery voltage is applied through the Wash Switch contacts and the Intermittent Controller to the OFF contacts of the Front Wiper Washer Switch. This action applies battery voltage to the low side of the front wiper motor. The front wiper motor is permanently grounded at G1O4 and will continue to operate in low as long as the Wash Switch is held in the ON position.

The front wiper motor Pawl and Switch will engage as the Motor turns, and its contacts will remain closed until the wipers are in the PARK position. While the Pawl and Switch contacts are closed, voltage is applied through the wiper washer Fuse, the front wiper motor Pawl and Switch contacts and the OFF contacts of the Front Wiper Washer Switch to the low side of the front wiper motor. In this manner, the wipers will complete at least one sweep after the Wash Switch has been released.

Mist Operation

When the Front Wiper Washer Switch is moved to the "MIST" position, battery voltage is applied to the low side of the front wiper motor through the wiper washer Fuse and the Front Wiper Washer Switch. The front wiper motor starts to turn and engages the front wiper motor pawl and Switch. While the pawl is turning with the motor, the switch remains closed for one wipe cycle. With this switch closed, battery voltage is applied through the wiper washer Fuse, the Pawl and Switch contacts and the OFF contacts of the Front Wiper Washer Switch to the low side of the front wiper motor. In this manner, the front wiper motor will complete one full wipe cycle after the Front Wiper Washer Switch has been released from the "MIST" position.


Intermittent Operation

With the Front Wiper Washer Switch in the "INT" position, battery voltage is applied through the wiper washer Fuse to the coil of an electronic relay in the Intermittent Controller and to a condenser also in the Intermittent Controller. The condenser charges to voltage and the relay is energized as soon as power is applied. When the switch in the energized relay closes, current flows through the YEL/BLU wire, BLU/WHT wire, Front Wiper Washer Switch and BLU wire to the front wiper motor low side. The wipers begin to operate at low speed.

By the time the front wiper motor makes one complete sweep and the front wiper motor pawl and Switch has engaged, the condenser in the Intermittent Controller has discharged. This discharge in the condenser causes the Intermittent Controller Relay coil to de-energize, and the switch in the relay to open. Current flow to the wipers is then cut off until the condenser is recharged. In this manner, intermittent wiper operation is achieved through the charging and discharging of the Intermittent Controller condenser.


Low Operation

With the Front Wiper Washer Switch in the "LO" position, battery voltage is applied through the wiper washer Fuse, and the "LO" contacts of the Front Wiper Washer Switch to the low side of the front wiper motor. Since the front wiper motor is permanently grounded at G104, the motor operates at low speed as long as the switch remains in this position. When the switch is placed in the "OFF" position, the Pawl and Switch assembly provides voltage to the motor until the wipers are in the PARK position.


High Operation

With the Front Wiper Washer Switch in the "HI" position, battery voltage is applied through the wiper washer Fuse, and the HIGH contacts of the Front Wiper Washer Switch to the HIGH side of the front wiper motor. Since the front wiper motor is permanently grounded at G104, the motor operates at high speed as long as the switch remains in this position. When the switch is placed in the "OFF" position, the Pawl and Switch assembly provides voltage to the motor until the wipers are in the PARK position.