Front Wiper and Washer Systems

WIPER (PULSE)

With the Ignition Switch in ACCY or RUN, voltage is available to the Wipers and Washers through the WIPER Fuse and the WHT (93) wire.

In the LO position, the Wiper/Washer Switch supplies voltage to the GRA (91) wire and the Delay/Speed/Wash Control. The Delay/Speed/Wash Control provides ground to the Park/Run Relay which is energized and supplies voltage to the brushes 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 the PPL (92) wire directly to a second armature terminal of the Wiper Motor. The wipers run at high speed. When the Wiper/Washer Switch is turned to OFF, the Wipers complete the last sweep at low speed and park.

When the Wipers are turned off, the Wiper Motor runs at low speed until the wiper blades reach the PARK position. At that time the Park/Run Relay opens and shunts the Wiper Motor to stop it immediately. The wiper blades remain in the PARK position.

PULSE

With the Wiper/Washer Switch in PULSE, voltage is applied to the GRA (91) wire, the Wiper Motor Module and the Solid-State Control Board. Voltage is applied to the Park/Run Relay coil which is momentarily grounded by the Delay/Speed/Wash control circuit and the relay closes. Battery voltage is supplied by the WHT (93) wire through the closed contacts of the Relay to run the Wiper Motor at LO speed. The Relay remains energized as long as the contacts of the Park/Run Switch remain closed. When the wiper blades have reached PARK, the Park/Run Switch opens, de-energizing the Park/Run Relay. The wiper blades remain in PARK until the Control Board grounds the Park/Run Relay coil to start another sweep. The delay time between sweeps is controlled by the delay resistors. The delay can be adjusted from 0 to 43 seconds.

WASHER

When the Washer Switch is depressed, voltage is applied to the Solid-State Control Board in the Wiper Motor Module. The Control Board supplies battery voltage to the Washer Motor through the ORN (98) wire, Wiper Switch and PNK (94) wire. It also starts the wiper cycle through the low speed brushes of the Wiper Motor. The Washer continues to run as long as the switch is held down. The Solid-State Control Board keeps the Wipers on for approximately six seconds after the Washer goes off. If the Washer is switched ON during the DELAY operation, the Wipers run in low speed for six seconds. When the Wash cycle is completed, the Wipers return to the pulse operation.