Wiper and Washer Systems: Description and Operation

Multi - Function Switch With Integral Wiper/Washer Switch:

WIPER SYSTEM
The wiper/washer switch is mounted on the right side of the multi-function switch on the steering column, behind the steering wheel. The wiper switch is a resistive multiplexed network that provides an input to the Body Control Module (BCM) which then opens/closes the wiper relay.

The wiper system has LOW, HIGH, and INTERMITTENT switch positions. The intermittent wiper
system, in addition to low and high speeds, has a delay mode and a pulse wipe mode.

The intermittent wiper function is integral to the wiper switch. The wiper switch also includes the MIST feature which provides a single wipe when actuated.

The wiper motor is serviced separately from the wiper assembly. The wiper linkage is crimped onto the assembly and cannot be detached.

The wiper function can be checked using the DRB III(R) scan tool.

Move the control lever up to select the desired wiper speed. Move the lever upward to the second detent for Low speed wiper operation, or to the third detent for High speed operation.

Use the intermittent wiper when weather conditions make a single wiping cycle, with a variable pause between cycles, desirable. Move the lever to the DEL position, then select the delay interval by turning the end of the lever. The delay can be regulated from a maximum of approximately 18 ± 0.5 seconds between cycles, to a cycle every second ± 0.5 second.

The windshield wipers will only operate with the ignition switch in the ACCESSORY or IGNITION RUN position. The wiper circuit is protected against

over loads by a fuse in the junction block. This protects the circuitry of the wiper system and the vehicle. The wiper motor has permanent magnet fields.

The intermittent wiper delay mode has a range of 1 ± 0.5 to 18 ± 0.5 seconds. Pulse wipe is accomplished by holding stalk lever in the WASH position momentarily. The wiper blades then sweep once or twice after the WASH at low speed and then return to the previous wiper switch mode.

The wiper system completes the wipe cycle when the switch is turned OFF. The blades park in the lowest portion of the wipe pattern.

Push down on the wiper lever to activate a single wipe to clear off road mist or spray from a passing vehicle. As long as the lever is held down, the wipers will continue to operate.

WASHER SYSTEM
This vehicle is equipped with an electrically operated windshield washer pump. The washers are operated by a switch in the multi-function switch control lever. The lever is located on the right side of the steering column.

The electric pump assembly is mounted directly to the reservoir. A permanently lubricated motor is coupled to an impeller type pump. The pump and reservoir are serviced as separate assemblies.

To use the washer, pull the stalk lever toward you and hold while spray is desired. If the stalk lever is pulled while in the delay range, the wiper will operate for two wipe cycles (± 1) after the stalk lever is released, and then resume the intermittent interval previously selected.

The wash function can be accessed in the OFF position of the wiper control switch. Pulling the washer stalk lever rearward when the switch is in the OFF position will operate the wipers and washer motor pump continuously until the stalk lever is released. Releasing the stalk 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.

If the stalk lever is pulled while in the OFF position, the wipers will operate for two wipe cycles, then turn OFF.

Fluid, gravity fed from the reservoir, is forced by the pump through rubber hoses to the hood mounted nozzles which direct the fluid streams to the windshield.