Wiper Description

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 Rear Window Wiper/Washer Module. The duration of the relay interval is determined by the Pulse Delay Resistance in the Rear Window Wiper/Washer Switch.

In the ON position, the Rear Window Wiper/Washer Switch supplies Voltage to the Pulse/Speed/Wash Control through GRY (391). The Pulse/Speed/Wash Control provides ground to the Park/Run Relay which is energized and supplies voltage to the Rear Window Wiper/Washer Motor Brushes. The wipers run until turned to OFF.

When the Rear Window Wiper/Washer Switch is turned to off, the Rear Window Wiper/Washer Motor runs at LO speed until the wiper blade reaches the PARK position. The Park/Run Relay then opens and shunts the Rear Window Wiper/Washer Motor to stop the wiper blade immediately. The wiper blade remains in the PARK position.

With the Rear Window Wiper/Washer Switch in PULSE, Voltage is supplied to the Rear Window Wiper/Washer Motor Module through GRY (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 LT BLU 97 through the closed contacts of the relay to run the Rear Window Wiper/Washer Motor at LO speed. The relay remains energized as long as the contacts of the Park/Run Switch remain closed. When the wiper blade reaches PARK, the Park/Run Switch opens, de-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 Resistor. The delay is approximately 9 seconds.