Rear Wipers & Washers

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, which are described in further detail elsewhere in this service information:

- Rear Washer Nozzle - The rear washer nozzle is secured by a snap fit into a mounting hole in the liftgate outer panel above the liftgate glass. The rear washer nozzle includes an integral rear check valve.

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

- Rear Washer Pump/Motor - The rear washer pump/motor unit is located in a dedicated hole on the lower outboard side of the washer reservoir, ahead of the left front wheel housing. The rear washer pump mounting hole is located higher on the reservoir than the front washer pump mounting hole.

- 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 liftgate outer panel near the base of the liftgate flip-up glass.

- Rear Wiper Arm Park Ramp - The molded rubber rear wiper arm park ramp is secured with a screw to the liftgate 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 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 liftgate 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 liftgate beneath the liftgate flip-up glass opening. The rear wiper module includes the module bracket, the rear wiper motor, and the rear wiper electronic control circuitry

- Right Multi-Function Switch - The right (wiper) multi-function switch is secured to the right side of the multi-function switch mounting housing near the top of the steering column, just below the steering wheel. Only the control stalk for the right multi-function switch is visible. The remainder of the switch is concealed beneath the steering column shrouds. The right multi-function switch control stalk is dedicated to providing all of the driver controls for both the front and rear wiper and washer systems.

- Washer Reservoir - The rear washer system shares a single reservoir with the front washer system, but has its own dedicated washer pump/motor and plumbing. The washer reservoir is concealed between the left inner fender shield and the left outer fender panel, behind the inner fender liner and ahead of the left front wheel. The washer reservoir filler neck is the only visible portion of the reservoir, and it is accessed from the left front corner of the engine compartment. 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 - When the right multi-function switch control sleeve is moved to the On position, the rear wiper will be operated at a fixed speed, continual wipe cycle until the switch sleeve is moved to the Delay or Off positions, until the ignition switch is turned to the Off position, or until the liftgate flip-up glass is ajar.

- Intermittent Wipe Mode - When the right multi-function switch control sleeve is moved to the Delay position, the rear wiper will be operated in a fixed interval, intermittent wipe cycle until the switch sleeve is moved to the On or Off positions, until the ignition switch is turned to the Off position, until the liftgate flip-up glass is ajar, or until the right multi-function switch control stalk is pushed forward to activate the rear washer system. The intermittent wipe mode delay time has a fixed delay interval of about five to eight seconds between sweeps.

- Washer Mode - When the right multi-function switch control stalk is pushed forward to activate the rear washer system, washer fluid will be dispensed from the washer reservoir onto the liftgate glass through the rear washer nozzle and the rear wiper will operate in a fixed cycle (not intermittent) for as long as the rear washer pump/motor unit remains energized.

- Wipe-After-Wash Mode - When the right multi-function switch control stalk is released from the momentary Wash position, the wipe-after-wash feature will continue to operate the rear wiper at a fixed cycle for about three additional wiper sweeps before returning to the previously selected mode.

The rear wiper and washer system is intended to provide the vehicle operator with a convenient, safe, and reliable means of maintaining visibility through the liftgate 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 outside liftgate 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 control stalk of the right multi-function switch that extends from the right side of the steering column, just below the steering wheel. Rotating the control sleeve on the control stalk to a detent position selects the rear wiper system operating mode. Moving the switch control stalk forward actuates the momentary rear washer system switch. The right multi-function switch provides hard wired outputs to the rear wiper module and the rear 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 liftgate flip-up glass ajar switch is closed. When the ignition switch is in the Accessory or On positions, battery current from a fuse in the Junction Block (JB) is provided to the right multi-function switch through a fused ignition switch output (run-acc) circuit. The internal circuitry of the right (wiper) control stalk of the right multi- function switch then provides battery current signals through a rear wiper motor control circuit and a rear wiper motor delay control circuit to the rear wiper module. The multi-function switch circuitry also uses this battery current input to directly control the operation of the rear 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 liftgate 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 liftgate flip-up glass ajar switch on a liftgate flip-up 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.

OPERATING MODES
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 sleeve on the right (wiper) multi-function switch control stalk is selected, the multi-function switch circuitry directs a battery current signal to the rear wiper module through the rear wiper motor control circuit, causing the rear wiper to cycle continuously at a fixed speed.

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

Wash Mode
When the control stalk of the right (wiper) multifunction switch is moved to the momentary Wash position, the multi-function switch circuitry directs battery current to the rear washer pump/motor unit through the rear washer pump motor control circuit, and battery current signals are also provided to the rear wiper module on both the rear wiper motor control circuit and the rear wiper motor delay control circuit. This will cause the rear 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 control stalk of the right (wiper) multifunction switch is released from the momentary Wash position, the rear 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.