An electrically operated 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:

•

Front Control Module - 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 and the Power Distribution Center (PDC).
(Refer to 8 - ELECTRICAL/POWER DISTRIBUTION - DESCRIPTION).

•

Heater-Air Conditioner Control (1) - The vehicle operator controls all rear wiper and washer system functions
through two switches that are operated by a single rotary control knob in the heater-air conditioner control
located in the center stack area of the instrument panel. The heater-air conditioner control sends electronic
rear wiper and rear washer switch status messages to the ElectroMechanical Instrument Cluster (EMIC over
the Controller Area Network (CAN) data bus. (Refer to 24 - HEATING & AIR CONDITIONING/CONTROLS/A/C
HEATER CONTROL - DESCRIPTION).

•

Instrument Cluster - The ElectroMechanical Instrument Cluster (EMIC) is also known as the Cab Control
Node (CCN) in this vehicle. The EMIC/CCN is located in the instrument panel above the steering column
opening, directly in front of the driver. (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DESCRIPTION).

•

Rear Washer Nozzle (2) - A fluidic rear washer nozzle is secured by latch features to a mounting hole in the
liftgate header panel and to the right of the Center High-Mounted Stop Lamp (CHMSL) above the liftgate glass.

•

Rear Washer Plumbing - The plumbing for the washer system consists of rubber hoses and molded plastic
fittings. The plumbing is routed along the underside of the Power Distribution Center (PDC) bracket to the
engine compartment from the washer reservoir. The rear washer hose is routed through the dash panel from
the engine compartment into the passenger compartment, up the left 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 - 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 glass.

•

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

REAR WIPERS/WASHERS - SERVICE INFORMATION

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•

Rear Wiper Motor (3) - The rear wiper motor output shaft is the only visible component of the rear wiper
motor. The remainder of the motor is concealed within the liftgate beneath the liftgate glass opening. The rear
wiper motor includes the motor bracket, the rear wiper motor, and the rear wiper motor park switch.

•

Rear Wiper Relay - The rear wiper relay is located in the Power Distribution Center (PDC) in the engine com-
partment near the battery.

•

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 integral to the engine coolant
reserve bottle located in 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 appro-
priate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair proce-
dures, 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.

OPERATION

The rear wiper and washer system is designed to pro-
vide the vehicle operator with a convenient, safe, and
reliable means of maintaining visibility through the lift-
gate 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 glass surface that might be encoun-
tered while driving under numerous inclement operat-
ing conditions.

The vehicle operator initiates all rear wiper and washer system functions with the rear wiper and washer switch
located in a corner of the heater-air conditioner control (2), just below the radio on the instrument panel. Rotating
the rear wiper and washer switch control knob (1) to a detent position selects the rear wiper system operating
mode, either continuous or intermittent. Intermittent operation provides one of four fixed delay intervals, from five to
21 seconds. Depressing the control knob activates the rear washer system. When a rear wiper or washer switch
mode is selected, the circuitry within the heater-air conditioner control sends an electronic rear wiper/washer switch
status message over the Controller Area Network (CAN) data bus to the Front Control Module (FCM) over the CAN
data bus requesting the appropriate rear wiper and washer system operating modes.

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 heater-air conditioner control, the FCM, or the electronic message inputs to or outputs from
the heater-air conditioner control or FCM that control the rear wiper and washer system operating modes. The most
reliable, efficient, and accurate means to diagnose the heater-air conditioner control 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.
Refer to the appropriate diagnostic information.

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