Part 2 of 2

Fig. 2 Wye Fitting And Check Valve:

CHECK VALVE
A washer system check valve is standard equipment on this model. The check valve is integral to the washer nozzle plumbing wye fitting located on the underside of the rear hood panel reinforcement in the engine compartment. The check valve consists of a molded plastic body with a round center section. Three barbed hose nipples are formed in a wye configuration on the outside circumference of the center section of the valve body. Within the check valve body, a small check valve operated by a small coiled spring restricts flow through the unit until the valve is unseated by a predetermined inlet fluid pressure. The check valve cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.

The check valve provides more than one function in this application. It serves as a wye connector fitting between the engine compartment and washer nozzle sections of the washer supply hose. It also prevents washer fluid from draining out of the washer supply hoses back to the washer reservoir. This drain-back would result in a lengthy delay from when the washer switch is actuated until washer fluid was dispensed through the washer nozzles, because the washer pump would have to refill the washer plumbing from the reservoir to the nozzles. Finally, the check valve prevents washer fluid from siphoning through the washer nozzles after the washer system is turned Off. When the washer pump pressurizes and pumps washer fluid from the reservoir through the washer plumbing, the fluid pressure overrides the spring pressure applied to the check valve and unseats the valve, allowing washer fluid to flow toward the washer nozzles. When the washer pump stops operating, spring pressure seats the check valve and fluid flow in either direction within the washer plumbing is prevented.

Fig. 4 Intermittent Wipe Module:

INTERMITTENT WIPE MODULE
An intermittent wipe module is used on vehicles that are not equipped with the optional Vehicle Theft Security System (VTSS). The intermittent wipe module is concealed under the instrument panel, where it is secured to the tab of a stamped steel blade-type mounting bracket that is welded to the underside of the instrument panel cross body structural support above the glove box opening. The intermittent wipe module is enclosed within a molded plastic housing with an integral external connector receptacle that connects it to the vehicle electrical system through a take out and connector of the instrument panel wire harness. A mounting slot that is also integral to the intermittent wipe module housing slides over and snaps onto the tab of the mounting bracket.

The intermittent wipe module utilizes integrated circuitry and hard wired inputs from the wiper and washer switch circuitry of the multi-function switch and the wiper park switch within the wiper motor to provide the intermittent wipe system delay and wipeafter-wash features of the intermittent wipe system through a hard wired output to the low speed brush of the wiper motor. The intermittent wipe module cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.

The intermittent wipe module contains integrated circuitry that allows it to monitor hard wired inputs from the wiper switch and washer switch circuitry within the multi-function switch and the park switch circuitry within the wiper motor. In response to those inputs, the internal circuitry of the intermittent wipe module provides control outputs to the low speed brush of the wiper motor. The intermittent wipe delay time selected by the driver provides a resistor multiplexed output to the intermittent wipe module, and an electronic timer circuit within the intermittent wipe module is used to accomplish the selected delay interval. If the washer system is activated while the wiper system is turned OFF, the intermittent wipe module will operate the wiper motor for approximately three wipes, then turn the wiper motor OFF.

Because of the active electronic elements within the intermittent wipe module, it cannot be tested with conventional automotive electrical test equipment. If the intermittent wipe module is believed to be faulty, the hard wired input and output circuits of the module should be tested, then replace the module with a known good unit to confirm system operation.