Wiper and Washer Systems: Description and Operation
GENERAL INFORMATIONWIPER SYSTEM
The wiper system provides the driver with normal wipe (low and high speeds), intermittent wipe, wipe after wash and mist wipe functions. The driver selects the wiper function via a resistive multiplexed stalk switch mounted on the steering column.
Other wiper system features:
Speed Sensitive Intermittent Wipe Mode - There are six individual delay times with a minimum delay of 1/2 second to a maximum of 18 seconds. When the vehicle speed is under 10 MPH, the delay time is doubled providing a range from one second to 36 seconds.
Mist Wipe - When the wiper is off and the driver presses the mist control for more than 125 millisecond, one wipe cycle in low speed mode will be provided. The wipe will continue in low speed as long as the switch is held in that position.
Wiper After Wash Mode - When the driver presses the wash button for over 3/8 second and then releases it, the wiper will continue to run for two additional wipe cycles.
WINDSHIELD WASHERS
All models are equipped with electric operated windshield washer pumps. The wash function can be accessed in the OFF or ON position of the multi-function wiper control switch.
System Operation
Pulling the lever towards the driver when the wiper switch is in the OFF position will operate the wipers and washer motor pump continuously until the lever is released. Releasing the lever will stop the washer pump but the wipers will complete the current wipe cycle. Followed by an average of two more wipe cycles (± 1) before the wipers park and the module turns off.
The electric pump assembly is mounted with a grommet directly to the reservoir. Fluid is gravity fed from the reservoir to the motor. The fluid is forced by the pump through rubber hoses to the hood mounted nozzles which direct the fluid streams to the windshield. The hose assembly has two one way flow check valves located just before each hood nozzle. The purpose of the check valves is to improve fluid flow response time and to prevent excessive washer fluid staining the surface of the hood. The hood mounted nozzles evenly distribute washer fluid across the surface of the windshield. The nozzles are not adjustable. The pump and reservoir are serviced as separate assemblies.