Rear Wipers & Washers

An electrically operated fixed interval intermittent rear wiper and washer system includes major components:
- Rear Washer Nozzle - The rear washer nozzle is secured by a snap fit into a mounting hole in the liftgate spoiler assembly, above the liftgate glass. The check valve is mounting in line between the liftgate opening and liftgate.
- 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, down the right side, up the right D-pillar, to the rear roof header. The plumbing is then routed through grommets in the rear roof header and the liftgate inner panel, then into the lift-gate spoiler assembly to the fitting for the rear washer nozzle.
- Rear Washer Pump/Motor - The rear washer pump/motor 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 glass.
- 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 Motor - 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.
- 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.

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 or until the ignition switch is turned to the Off position.
- 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, 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, the BCM will send a bus message to the IPM to turn on the rear washer pump motor and 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 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 motor and the rear washer pump/motor 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. When the ignition switch is in the Accessory or On positions, battery current from a fuse in the IPM 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 motor. The multi-function switch circuitry also uses this battery current input to directly control the operation of the rear washer pump/motor unit.

When diagnosing the rear wiper/washer system, use of a DRBIII(R) scan tool and refer to the appropriate Body Diagnostic Procedures manual.

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 motor 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 motor 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 through the rear washer pump motor control circuit, and battery current signals are also provided to the rear wiper motor on both the rear wiper motor control circuit and the rear wiper motor delay control circuit. This will cause the rear washer pump/motor 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 motor will provide several additional wipe cycles to complete the wipe-after-wash mode cycle.