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Fig.1 Rear Wiper & Washer System:

REAR WIPERS/WASHERS
An electrically operated fixed interval intermittent rear wiper and washer system is standard factory-installed equipment on this model.

The rear wiper and washer system includes the following major components:
- Multi-Function Switch - The multi-function switch is located on the top of the steering column, just below the steering wheel. The multi-function switch includes a left (lighting) control stalk and a right (wiper) control stalk. The right control stalk is dedicated to providing all of the driver controls for both the front and rear wiper systems. (Refer to LAMPS/LIGHTING - EXTERIOR/ MULTI-FUNCTION SWITCH - DESCRIPTION).

- Rear Check Valve - The rear washer system check valve is located in the washer plumbing between the rear roof header and the roof outer panel near the rear washer nozzle.

- Rear Washer Nozzle - The rear washer nozzle is secured by a snap fit into a mounting hole in the roof outer panel above the rear flip-up glass opening.

- Rear Washer Plumbing - The plumbing for the rear washer system consists of rubber hoses and molded plastic fittings. The plumbing is routed along the right side of the engine compartment from the washer reservoir, through the dash into the passenger compartment, up the right cowl side and A-pillar to the headliner, and above the headliner to the rear washer nozzle fitting within the rear roof header.

- Rear Wiper Arm - The single rear wiper arm is secured by a nut directly to the rear wiper motor output shaft, which extends through the center of the tailgate outer panel near the base of the rear flip-up glass.

- Rear Wiper Arm Park Ramp - The molded rubber rear wiper arm park ramp is secured with a screw to the tailgate outer panel to the right of the rear wiper motor output shaft bezel. When the rear wiper system is not in operation, the rear wiper arm is parked OFF of the rear flip-up glass on this ramp so that it will not interfere with or be damaged by the flip-up glass operation.

- Rear Wiper Blade - The single rear wiper blade is secured to the rear wiper arm with an integral latch, and is parked OFF of the rear flip-up glass when the rear wiper system is not in operation.

- Rear Wiper Module - The rear wiper motor output shaft is the only visible component of the rear wiper module. The remainder of the module is concealed within the tailgate below the rear flip-up glass opening. The rear wiper module includes the module bracket, the rear wiper motor, and the rear wiper electronic control circuitry.

- Washer Pump/Motor - The reversible electric washer pump/motor unit is located in a dedicated hole on the lower outboard side of the washer reservoir, behind the right front wheel house splash shield. This single reversible washer pump/motor provides washer fluid to either the front or rear washer system plumbing, depending upon the direction of the pump motor rotation. (Refer to FRONT WIPERS/WASHERS/WASHER PUMP MOTOR - DESCRIPTION).

- Washer Reservoir - The washer reservoir is concealed behind the right front wheel house splash shield ahead of the right front wheel. The washer reservoir filler neck is the only visible portion of the reservoir, and it is accessed from the right front corner of the engine compartment. This single washer reservoir is shared by both the front and rear washer systems. (Refer to FRONT WIPERS/WASHERS/WASHER RESERVOIR - DESCRIPTION).

Hard wired circuitry connects the rear wiper and washer system components to the electrical system of the vehicle. These hard wired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other, to the vehicle electrical system and to the rear wiper and washer system components through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

OPERATING MODES
The components of the rear wiper and washer system are designed to work in concert to provide the following operating modes:
- Continuous Wipe Mode - The control ring on the right (wiper) control stalk of the multi-function switch has an ON position. When selected, this switch position will cause the rear wiper motor to operate in a continuous manner at a fixed wipe cycle speed.

- Intermittent Wipe Mode - The control ring on the right (wiper) control stalk of the multi-function switch has a Delay position. When selected, this switch position will cause the rear wiper motor to operate in an intermittent manner at a fixed interval wipe cycle speed.

- Washer Mode - The control ring on the right (wiper) control stalk of the multi-function switch has two momentary Wash positions, one at the end of each direction of control ring rotation. When the control ring is rotated to the downward (counterclockwise) Wash position, the rear washer system will dispense washer fluid onto the flip-up glass and the rear wiper motor will operate in a continuous mode for as long as the switch is held closed, then provide several additional wipe cycles after the washer switch is released (wipe-after-wash mode). When the control ring is rotated to the upward (clockwise) Wash position, the rear washer system will dispense washer fluid onto the flip-up glass and the rear wiper motor will operate in a continuous mode for as long as the switch is held closed, then return to fixed wipe mode operation after the washer switch is released.

- Wipe-After-Wash Mode - The control ring on the right (wiper) control stalk of the multi-function switch has two momentary Wash positions, one at the end of each direction of control ring rotation. When the control ring is rotated to the downward (counterclockwise) Wash position, the rear washer system will dispense washer fluid onto the flip-up glass and the rear wiper motor will operate in a continuous mode for as long as the switch is held closed, then provide several additional wipe cycles after the washer switch is released.

The rear wiper and washer system is designed to provide the vehicle operator with a convenient, safe, and reliable means of maintaining visibility through the rear flip-up glass. The various components of this system are designed to convert electrical energy produced by the vehicle electrical system into the mechanical action of the wiper blade to wipe the outside surface of the glass, as well as into the hydraulic action of the washer system to apply washer fluid stored in an on-board reservoir to the area of the glass to be wiped. When combined, these components provide the means to effectively maintain clear visibility for the vehicle operator by removing excess accumulations of rain, snow, bugs, mud, or other minor debris from the swing gate flip up glass surface that might be encountered while driving the vehicle under numerous types of inclement operating conditions.

The vehicle operator initiates all rear wiper and washer system functions with the right (wiper) control stalk of the multi-function switch that extends from the right side of the steering column, just below the steering wheel. Rotating the control ring on the control stalk to a detent position selects the OFF, Delay, or ON rear wiper system operating modes. Rotating the control ring on the control stalk to either of two Wash positions actuates the momentary rear washer system switch. The multi-function switch provides hard wired outputs to the rear wiper module and the washer pump/motor unit for all rear wiper and washer system functions.

The rear wiper and washer system will only operate when the ignition switch is in the Accessory or ON positions, and the rear flip-up glass and tailgate ajar switches are closed. Battery current is directed from a fuse in the Junction Block (JB) to the multi-function switch through a fused ignition switch output (RUN/ACC) circuit. The internal circuitry of the right (wiper) control stalk of the multi-function switch then provides battery current signals through a rear wiper on driver circuit and a rear wiper intermittent driver circuit to the rear wiper module and to the Body Control Module (BCM). The BCM uses these rear wiper system inputs as a signal to lock the rear flip-up glass and the tailgate to prevent the rear flip-up glass or tailgate from being opened for as long as the rear wiper is operating. The multi-function switch circuitry also uses this battery current and a ground circuit input to directly control the operation and direction of the reversible electric washer pump/motor unit.

A separate fuse in the JB provides battery current to the electronic control circuitry of the rear wiper module through a fused B(+) circuit. The rear wiper module uses this fused B(+) input to park the rear wiper blade off of the rear flip-up glass if the ignition switch is turned to the OFF position while the rear wiper is operating, or if the ignition switch is turned to the OFF position before the rear wiper blade has parked. However, if the ignition switch is turned to the OFF position while the rear wiper is operating, then turned back ON, the rear wiper switch must be cycled to the OFF position and back to the ON or Delay position before the rear wiper will operate again. In addition, the rear wiper module receives an input from the rear flip-up glass ajar switch on a flip-up glass ajar switch sense circuit, which prevents the rear wiper from operating when the flip-up glass is not closed or fully latched.

The hard wired circuits and components of the rear wiper and washer system may be diagnosed and tested using conventional diagnostic tools and procedures. Following are paragraphs that briefly describe the operation of each of the rear wiper and washer system operating modes.

Continuous Wipe Mode
When the ON position of the control ring on the right (wiper) control stalk of the multi-function switch is selected, the multi-function switch circuitry directs a battery current signal to the rear wiper module through the rear wiper on driver circuit, causing the rear wiper to cycle continuously at a fixed speed.

Intermittent Wipe Mode
When the Delay position of the control ring on the right (wiper) control stalk of the multi-function switch is selected, the multi-function switch circuitry directs a battery current signal to the rear wiper module through the rear wiper intermittent driver circuit, causing the rear wiper to cycle intermittently at a fixed delay interval.

Wash Mode
When the momentary Wash (after ON) position of the control ring on the right (wiper) control stalk of the multi-function switch is selected, the multi-function switch circuitry directs both battery current and ground to the washer pump/motor unit, and a battery current signal to be provided to the rear wiper module through the rear wiper on driver circuit. This will cause the washer pump/motor unit to be energized and the rear wiper to cycle continuously at a fixed speed for as long as the rear Wash switch is held closed.

Wipe-After-Wash Mode
When the momentary Wash (before OFF) position of the control ring on the right (wiper) control stalk of the multi-function switch is selected, the multi-function switch circuitry directs both battery current and ground to the washer pump/motor unit, and a battery current signal to be provided to the rear wiper module through the rear wiper on driver circuit. This will cause the washer pump/motor unit to be energized and the rear wiper to cycle continuously at a fixed speed for as long as the rear Wash switch is held closed. When the control ring is released to the OFF position, the washer pump/motor is de-energized, but the circuitry within the rear wiper module will provide several additional wipe cycles to complete the wipe-after- wash mode cycle.

Fig.3 Rear Check Valve:

REAR CHECK VALVE
A rear washer system check valve is standard equipment on this model. The rear check valve is located in the washer plumbing between the rear roof header and the roof outer panel near the rear washer nozzle. The rear check valve consists of a molded plastic body with a round center section and barbed hose nipples at each end. An arrow formation molded into the center section of the valve body indicates the direction of flow through the valve. The rear check valve cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.

The rear check valve prevents washer fluid from draining out of the rear washer supply hoses back to the washer reservoir. This drain-back would result in a lengthy delay from when the rear washer switch is actuated until washer fluid was dispensed through the rear washer nozzle, because the washer pump would have to refill the rear washer plumbing from the reservoir to the nozzle. The check valve also prevents washer fluid from siphoning through the rear washer nozzle after the rear washer system is turned Off.

Within the check valve body, a small check valve is held in place against a seat by a small coiled spring to restrict flow through the unit until the valve is unseated by a predetermined inlet fluid pressure. When the washer pump pressurizes and pumps washer fluid from the reservoir through the rear washer plumbing, the fluid pressure overrides the spring pressure applied to the check ball within the valve and unseats the valve, allowing washer fluid to flow toward the rear washer nozzle. When the washer pump stops operating, spring pressure seats the check valve and fluid flow in either direction within the rear washer plumbing is prevented.