Wiper

In addition to the features of a conventional (non-pulse) Wiper System (MIST, LO and HI speeds), the Rear Pulse Wiper/Washer System includes an operating mode in which the wiper makes single strokes with an adjustable time interval between strokes. The time interval is controlled by a Solid-State Pulse/ Speed/ Wash Control in the Wiper Motor Module. The duration of the relay interval is determined by the Pulse Delay Resistance in the Wiper/ Washer Switch.

In the LO position, the Wiper/ Washer Switch supplies voltage to the Pulse/ Speed/ Wash Control through CKT 391. The Pulse/ Speed/ Wash Control provides ground to the Park/ Run Relay which is energized and supplies voltage to the branches of the Wiper Motor. The wipers run at low speed until they are turned off.

With the Wiper/ Washer Switch in the HI position. battery voltage is supplied from CKT 392 directly second armature terminal of the Wiper Motor. The wiper runs at high speed. When the Wiper/ Washer Switch is turned to OFF, the wiper completes the last sweep at low speed and park.

When the wiper is turned off. the Wiper Motor runs at low speed until the wiper blade reaches the PARK position. At that time the Park/ Run Relay opens and shunts the Wiper Motor to stop it immediately. The wiper blade remains in the PARK position.

When the control is moved to MIST and released, the wiper makes one sweep at low speed and return to PARK. The circuit operation is the same as low speed.

With the Wiper Washer Switch in PULSE, voltage is supplied to the Wiper Motor Module through CKT 391. Voltage is supplied to the Park/ Run Relay coil which is momentarily grounded by the Pulse/ Speed/ Wash Control circuit. and the relay closes. Battery voltage is supplied by CKT 97 through the closed contacts of the Relay to run the Wiper Motor at LO speed. he relay remains energized as long as the contacts of the Park/turn Switch remain closed. When the wiper blade reaches PARK, the Park/ Run Switch opens, dc-energizing the Park/ Run Relay. The wiper blade remains in PARK until the Control Board grounds the Park Relay coil to start another sweep. The delay time between sweeps is controlled by the pulse delay resistors. The delay can be adjusted from 0 to 43 seconds.