Rear

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:
- Front Control Module (1) - The Front Control Module (FCM) is integral to the Integrated Power Module (IPM). The FCM/IPM is located in the engine compartment, near the battery.
- Rear Washer Nozzle (3) - The fluidic rear washer nozzle is integral to the Center High-Mounted Stop Lamp (CHMSL) located on the liftgate outer panel above the liftgate flip-up glass. The rear washer nozzle includes an integral 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 where it is connected to a hose integral to the headliner that runs from the A-pillar to the rear washer nozzle on the upper liftgate header.
- Rear Wiper Arm & Blade (5) - 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. The rear wiper blade is secured to the rear wiper arm with an integral latch, and is parked off of the glass when the rear wiper system is not in operation.
- 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 glass on this ramp so that it will not interfere with or be damaged by the liftgate flip-up glass operation.
- Rear Wiper Module (4) - The rear wiper module includes the module bracket, two rubber-isolated wiper module mounts and the rear wiper motor. The 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 glass opening.
- Rear Wiper Relay - The rear wiper relay is an International Standards Organization (ISO) micro relay that is soldered into the Junction Block (JB) in the passenger compartment, underneath the instrument panel on the driver side of the vehicle.
- Right Multi-Function Switch - The right (wiper) multi-function switch is secured to and directly connected to the Steering Control Module (SCM), on the steering column just below the steering wheel. Only the switch control stalk extending from the right side of the steering column is visible, while the remainder of the switch is concealed beneath the steering column shrouds. The right multi-function switch is dedicated to providing all of the driver controls for both the front and rear wiper and washer systems.
- Steering Control Module (2) - The Steering Control Module (SCM) is secured to the top of the steering column, just below the steering wheel and is completely concealed beneath the steering column shrouds.
- Washer Reservoir - The rear washer system shares a single reservoir and reversible pump with the front washer system, but has its own dedicated plumbing. The washer reservoir is concealed between the left inner fender shield and the left outer fender panel, ahead of the left front wheel house splash shield. The filler neck and cap are the only visible components of the reservoir and, are 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.




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 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 sleeve (3) on the control stalk (1) 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 the various detent and momentary positions selects the rear wiper and washer system operating modes. The multi-function switch provides resistor multiplexed inputs to the Steering Control Module (SCM) for all of the rear wiper and washer system functions.

The SCM sends an electronic rear wiper/washer switch status message over the Controller Area Network (CAN) data bus to the Front Control Module (FCM) indicating the selected rear wiper and washer system operating mode. The FCM provides battery voltage and ground to operate the washer pump/motor unit and a control output to the rear wiper relay, which provides battery voltage to operate the rear wiper module. The SCM also provides hard wired control outputs to the rear wiper module on two circuits that indicate the selected operating mode and delay interval that the rear wiper module uses to control rear wiper motor operation.

Rear wiper/washer system operation is completely controlled by the SCM and FCM logic circuits, and that logic will only allow these systems to operate when the ignition switch is in the Accessory or On positions. Battery current is directed from the Integrated Power Module (IPM) to the rear wiper relay in the Junction Block (JB) through a fused B(+) circuit. The right multi-function switch circuitry receives a clean ground output from the SCM on a multi-function switch return circuit, then provides resistor multiplexed inputs to the SCM to indicate the selected rear wiper and washer system operating mode.

The hard wired circuits and components of the rear wiper and washer system may be diagnosed and tested using conventional diagnostic tools and procedures. However, conventional diagnostic methods may not prove conclusive in the diagnosis of the SCM, the FCM or the electronic message inputs to or outputs from the SCM or the FCM that control the rear wiper and washer system operating modes. The most reliable, efficient, and accurate means to diagnose the SCM or the FCM inputs and outputs related to the various rear wiper and washer system operating modes requires the use of a diagnostic scan tool.

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 continuous wipe position of the control sleeve on the control stalk of the multi-function switch is selected the SCM sends an electronic rear wiper switch status message to the FCM, which energizes the rear wiper relay. This directs battery current through the normally open contacts of the energized rear wiper relay to enable the rear wiper module. The SCM also provides a hard wired output to the rear wiper module indicating the selected mode, and the rear wiper module energizes the rear wiper motor causing the wipers to cycle at a fixed speed.

INTERMITTENT WIPE MODE
When the intermittent wipe position of the control sleeve on the control stalk of the multi-function switch is selected the SCM sends an electronic rear wiper switch status message to the FCM, which energizes the rear wiper relay. This directs battery current through the normally open contacts of the energized rear wiper relay to enable the rear wiper module. The SCM also provides a hard wired output to the rear wiper module indicating the selected mode, and the rear wiper module energizes the rear wiper motor causing the wipers to cycle at a predetermined fixed delay interval between wiper sweeps.

WASH MODE
When the control sleeve of the right multi-function switch is rotated counterclockwise to the rear momentary Wash position for more than about one-half second with the rear wiper system operating, the SCM sends an electronic washer switch status message to the FCM, which directs battery current and ground to the washer pump/motor unit. This will cause the washer pump to be energized in the rear washer direction for as long as the switch is held closed (up to approximately ten seconds) and to be de-energized when the control sleeve is released. The SCM also provides a hard wired output to the rear wiper module indicating the selected mode and if the rear wipers are operating in the intermittent mode, the rear wiper module operates the rear wiper motor at a fixed speed until the control sleeve is released.

WIPE-AFTER-WASH MODE
When the control sleeve of the right multi-function switch is rotated clockwise to the rear momentary Wash position for more than about one-half second while the rear wiper system is not operating, the SCM sends an electronic washer switch status message to the FCM, which directs battery current and ground to the washer pump/motor unit and energizes the rear wiper relay. This will cause the washer pump to be energized in the rear washer direction and the rear wiper module to be enabled for as long as the switch is held closed (up to approximately ten seconds) and to be de-energized when the control sleeve is released. and operate the rear wiper motor in a continuous speed mode for as long as the rear Wash switch is held closed (up to approximately ten seconds). The SCM also provides a hard wired output to the rear wiper module indicating the selected mode and the rear wiper module operates the rear wiper motor at a fixed speed until the control sleeve is released plus two additional wipe cycles before the SCM de-energizes the rear wiper relay and parks the rear wiper blade.