WipersWashers - Service Information

An electrically operated intermittent front wiper and washer system is standard factory-installed safety equipment on this vehicle. The wiper and washer system includes the following major components, which are described in further detail elsewhere in this service information:

 ElectroMechanical Instrument Cluster - The ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) is located on the instrument panel directly in front of the driver. Refer to DESCRIPTION .  Front Washer Nozzle (3) - Two fluidic front washer nozzles with integral check valves are secured by integral latch features to dedicated openings in the hood panel near the base of the windshield.  Front Washer Plumbing - The plumbing for the washer system consists of rubber hoses and molded

rubber or plastic fittings. The plumbing is routed across the front of the engine compartment to the right side of the engine compartment from the washer reservoir on the left side of the cooling module, and through the cowl plenum panel to the underside of the hood panel and the washer nozzles.  Front Wiper Arms And Blades (5) - The two front wiper arms are secured with nuts to the threaded ends of the two wiper pivot shafts, which extend through the cowl plenum cover/grille panel located near the base of the windshield. The two equal length front wiper blades are each secured to their equal length wiper arms with an integral latch, and are parked on the glass near the bottom of the windshield when the wiper system is not in operation.  Front Wiper Module (4) - The wiper pivot shafts are the only visible components of the front wiper module. The remainder of the module is concealed within the cowl plenum area beneath the cowl plenum cover/grille panel. The wiper module includes the wiper module bracket, three rubber-isolated wiper module mounts, the wiper motor, the wiper motor crank arm, the two wiper drive links, and the two wiper pivots.  Right Multi-Function Switch (6) - The right (wiper) multi-function switch and the left (lighting) multi- function switch are secured to brackets integral to the clockspring housing on the top of the steering column just below the steering wheel. The right multi-function switch is connected by a short jumper harness to the Steering Control Module (SCM), which is internal to the left multi-function switch housing. 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 - The Steering Control Module (SCM) is internal to the left multi-function switch housing, which is secured to a bracket integral to the left side of the clockspring housing on the top of the steering column just below the steering wheel. Only the left switch control stalk extending from the left side of the steering column is visible, while the remainder of the switch housing containing the SCM is concealed beneath the steering column shrouds. Refer to DESCRIPTION .  Totally Integrated Power Module (2) - The Totally Integrated Power Module (TIPM) is located in the engine compartment, near the battery. Refer to DESCRIPTION .  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, on the left side of the cooling module fan shroud. 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.  Washer Reservoir (1) - The washer reservoir is integral to the coolant reserve bottle, which sits astride the fan shroud of the cooling module. The reservoir filler cap is accessed from the left front corner of the engine compartment.

Hard wired circuitry connects the front 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 front 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.

An electrically operated fixed interval intermittent rear wiper and washer system is standard factory-installed equipment on this vehicle. The rear wiper and washer system includes the following major components, which are described in further detail elsewhere in this service information:

 ElectroMechanical Instrument Cluster - The ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) is located on the instrument panel directly in front of the driver. Refer to DESCRIPTION .  Rear Washer Nozzle (4) - A fluidic rear washer nozzle is secured by integral latch features to a mounting hole on the right side of the Center High Mounted Stop Lamp (CHMSL) on the liftgate outer panel above the liftgate flip-up glass opening.  Rear Washer Plumbing - The plumbing for the rear washer system consists of rubber hoses and molded rubber or plastic fittings. The plumbing is routed across the front of the engine compartment to the right side of the engine compartment from the washer pump and reservoir on the left side of the cooling module, and through the dash into the passenger compartment. Then it is routed up the right cowl side and A-pillar to the headliner, and above the headliner to the upper liftgate opening header, then through the upper inner liftgate panel to the rear washer nozzle.  Rear Wiper Arm And Blade (6) - 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. 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 Motor (5) - The rear wiper motor includes the motor bracket and three rubber-isolated mounting tabs. The wiper motor output shaft is the only visible component of the rear wiper motor. The remainder of the motor is concealed by the liftgate inner trim just below the liftgate glass opening.  Right Multi-Function Switch (3) - The right (wiper) multi-function switch and the left (lighting) multi- function switch are secured to brackets integral to the clockspring housing, on the top of the steering column just below the steering wheel. The right multi-function switch is connected by a short jumper harness to the Steering Control Module (SCM), which is internal to the left multi-function switch housing. 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 - The Steering Control Module (SCM) is internal to the left multi-function switch housing, which is secured to a bracket integral to the left side of the clockspring housing on the top of the steering column just below the steering wheel. Only the left switch control stalk extending from the left side of the steering column is visible, while the remainder of the switch housing containing the SCM is concealed beneath the steering column shrouds. Refer to DESCRIPTION .  Totally Integrated Power Module (2) - The Totally Integrated Power Module (TIPM) is located in the engine compartment, near the battery. Refer to DESCRIPTION .  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, on the left side of the cooling module fan shroud. 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.  Washer Reservoir (1) - The washer reservoir is integral to the coolant reserve bottle, which sits astride the fan shroud of the cooling module. The reservoir filler cap 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.

The front wiper and washer system is designed to provide the vehicle operator with a convenient, safe, and reliable means of maintaining visibility through the windshield 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 blades 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 outer surface of the windshield glass that might be encountered while driving the vehicle under numerous types of inclement operating conditions.

The vehicle operator initiates all front and rear wiper and washer system functions with the control stalk of the right (wiper) multi-function switch (1) that extends from the right side of the steering column, just below the steering wheel. Rotating the control knob (2) on the end of the control stalk, selects the OFF, DELAY, LOW, or HIGH front wiper system operating modes. In the DELAY mode, the control knob also allows the vehicle operator to select from one of five intermittent wipe delay intervals.

Pulling the control stalk rearward actuates the momentary front washer system switch, which selects the WASH and WIPE-AFTER-WASH modes, depending upon when and how long the switch is held closed. Pushing the control stalk downward actuates a momentary switch and selects the MIST mode, which cycles the wiper blades for as long as the switch is held closed then completes the current cycle and parks the blades at the base of the windshield after the switch is released.

The right multi-function switch provides hard wired analog and resistor multiplexed inputs to the Steering Control Module (SCM) internal to the left (lighting) multi-function switch housing for all of the wiper and washer system functions. The SCM then sends electronic wiper and washer switch status messages to the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN), over a Local Interface Network (LIN) data bus. The EMIC responds to the SCM inputs by sending electronic wiper and washer system request messages to the Totally Integrated Power Module (TIPM) over the Controller Area Network (CAN) data bus requesting the appropriate wiper and washer system operating modes.

Front wiper and washer system operation is completely controlled by the SCM, EMIC and TIPM logic circuits, and that logic will only allow these systems to operate when the ignition switch is in the ACCESSORY or ON positions. The TIPM uses intelligent, high current, self-protected high side switches to control wiper system operation by energizing or de-energizing the wiper motor low and high speed brushes. The TIPM uses an H- bridge circuit to control the operation of the reversible washer pump/motor unit. The right multi-function switch circuitry receives battery current and a clean ground output from the SCM, then provides analog and multiplexed inputs to the SCM to indicate the selected front wiper and front washer system mode.

The hard wired circuits and components of the front wiper and washer system may be diagnosed using conventional diagnostic tools and procedures. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the front wiper and washer system or the electronic controls or communication between other modules and devices that provide some features of the front wiper and washer system. The most reliable, efficient, and accurate means to diagnose the front wiper and washer system or the electronic controls and communication related to front wiper and washer system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

Following are paragraphs that briefly describe the operation of each of the front wiper and washer system operating modes.

When the LOW position of the control knob on the control stalk of the right (wiper) multi-function switch is selected the SCM sends an electronic wiper switch low status message to the EMIC over the LIN data bus, the EMIC relays an electronic wiper switch low request message to the TIPM over the CAN data bus, then the TIPM directs battery current to the low speed brush of the wiper motor, causing the wipers to cycle at low speed.

When the HIGH position of the control knob is selected the SCM sends an electronic wiper switch high status message to the EMIC, the EMIC relays an electronic wiper switch high request message to the TIPM, then the TIPM directs battery current to the high speed brush of the wiper motor, causing the wipers to cycle at high speed.

When the OFF position of the multi-function switch control knob is selected, the SCM sends an electronic wiper switch off status message to the EMIC, the EMIC relays an electronic wiper switch off request message to the TIPM, then one of two events will occur. The event that occurs depends upon the position of the wiper blades on the windshield at the moment that the control knob OFF position is selected.

If the wiper blades are in the down position on the windshield when the OFF position is selected, the park switch that is integral to the wiper motor is closed to ground, which provides a hard wired park switch sense input to the TIPM. The TIPM then de-energizes the wiper motor and the wiper motor ceases to operate. If the wiper blades are not in the down position on the windshield at the moment the OFF position is selected, the park switch is an open circuit and the TIPM continues running the wiper motor at low speed until the wiper blades are in the down position on the windshield and the park switch input to the TIPM is again closed to ground.

When the control knob on the control stalk of the right (wiper) multi-function switch is moved to one of the five DELAY interval positions the SCM sends an electronic wiper switch delay interval status message to the EMIC, the EMIC relays an electronic wiper switch delay interval request message to the TIPM, then the TIPM electronic intermittent wipe logic circuit responds by calculating the correct length of time between wiper sweeps based upon the selected delay interval input.

The TIPM monitors the changing state of the wiper motor park switch through a hard wired park switch sense input. This input allows the TIPM to determine the proper intervals at which to energize and de-energize the wiper motor intermittently for one low speed cycle at a time.

The TIPM logic is also programmed to provide vehicle speed sensitivity to the selected intermittent wipe delay intervals. In order to provide this feature the TIPM monitors electronic vehicle speed messages from the Controller Antilock Brake (CAB) or the Powertrain Control Module (PCM) and doubles the selected delay interval whenever the vehicle speed is about 16 kilometers-per-hour (10 miles-per-hour) or less.

When the control stalk of the right (wiper) multi-function switch is moved downward to the momentary MIST position, the SCM sends an electronic wiper mist mode status message to the EMIC, the EMIC relays an electronic wiper mist mode request message to the TIPM, then the TIPM energizes the low speed brush of the wiper motor for as long as the switch is held closed, then de-energizes the motor when the state of the switch changes to open, parking the wiper blades near the base of the windshield. The TIPM can operate the front wiper motor in this mode for only one low speed cycle at a time, or for an indefinite number of sequential low speed cycles, depending upon how long the switch is held closed.

When the control stalk of the right (wiper) multi-function switch is pulled rearward to the front momentary WASH position for more than about one-half second with the wiper system operating, the SCM sends an electronic washer switch status message to the EMIC, the EMIC relays an electronic washer switch request message to the TIPM, then the TIPM directs battery current and ground to the washer pump/motor. This will cause the washer pump/motor to be energized in the front wash direction for as long as the switch is held closed (up to approximately 10 seconds) and to be de-energized when the control stalk is released.

When the control stalk is pulled rearward to the front momentary WASH position while the front wiper system is operating in one of the DELAY interval positions, the washer pump/motor operation is the same. However, the TIPM also overrides the selected delay interval and operates the front wiper motor in a continuous low speed mode for as long as the control stalk is held in the front momentary WASH position, then reverts to the selected delay interval several wipe cycles after the control stalk is released. If the WASH switch is held closed for more than approximately 10 seconds, the TIPM will suspend washer pump/motor operation until the control stalk is released for about 2 seconds and then cycled back to the WASH position.

When the control stalk of the right (wiper) multi-function switch is pulled rearward to the front momentary WASH position for more than about one-half second while the wiper system is not operating, the SCM sends an electronic washer switch status message to the EMIC, the EMIC relays an electronic washer switch request message to the TIPM, and the TIPM directs battery current and ground to the washer pump/motor and energizes

the wiper motor in a continuous low speed mode for as long as the switch is held closed (up to approximately 10 seconds). When the control stalk is released, the TIPM de-energizes the washer pump/motor immediately, but allows the wiper motor to operate for two or three additional wipe cycles before it de-energizes the wiper motor and parks the wiper blades near the base of the windshield.

If the control stalk is held rearward for more than about 10 seconds, the TIPM will suspend washer pump/motor operation until the stalk is released for about 2 seconds and then cycled back to the WASH position; however, the wipers will continue to operate for as long as the switch is held closed. The TIPM monitors the changing state of the wiper motor park switch through a hard wired wiper park switch sense circuit input. This input allows the TIPM to count the number of wipe cycles that occur after the control stalk is released, and to determine the proper interval at which to de-energize the wiper motor to complete the WIPE-AFTER-WASH mode cycle.

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 outer surface of the liftgate flip- up glass that might be encountered while driving the vehicle under numerous types of inclement operating conditions.

The vehicle operator initiates all front and rear wiper and washer system functions with the control stalk (1) of the right (wiper) multi-function switch that extends from the right side of the steering column, just below the steering wheel. Rotating the control sleeve (3) on the control stalk to the OFF or INTERMITTENT detent positions or the momentary WASH position selects the rear wiper and washer system operating modes.

The right multi-function switch provides hard wired analog and resistor multiplexed inputs to the Steering Control Module (SCM) integral to the left (lighting) multi-function switch for all of the wiper and washer system functions. The SCM then sends electronic rear wiper/washer switch status messages to the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) over a Local Interface Network (LIN) data bus. The EMIC then sends electronic rear wiper/washer switch request messages to the Totally Integrated Power Module (TIPM) over the Controller Area Network (CAN) data bus requesting the appropriate rear wiper and washer system operating modes.

Rear wiper and washer system operation is completely controlled by the SCM, EMIC and TIPM logic circuits, and that logic will only allow these systems to operate when the ignition switch is in the ACCESSORY or ON positions, plus a delay after the ignition switch is turned to any other position long enough to allow the rear wiper motor to park the rear wiper blade off of the liftgate flip-up glass. The TIPM uses intelligent, high current, self-protected high side switches to control wiper system operation by energizing or de-energizing the rear wiper motor. The TIPM uses an H-bridge circuit to control the operation of the reversible washer pump/motor unit. The right multi-function switch circuitry receives a clean ground output from the SCM on a multi-function switch return circuit, then provides analog and resistor multiplexed inputs to the SCM to indicate the selected rear wiper and rear washer system mode.

The hard wired circuits and components of the rear wiper and washer system may be diagnosed using conventional diagnostic tools and procedures. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the rear wiper and washer system or the electronic controls or communication between other modules and devices that provide some features of the rear wiper and washer system. The most reliable, efficient, and accurate means to diagnose the rear wiper and washer system or the electronic controls and communication related to rear wiper and washer system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

Following are paragraphs that briefly describe the operation of each of the rear wiper and washer system operating modes.

When the INTERMITTENT WIPE position of the control sleeve on the control stalk of the right multi-function switch is selected, the SCM sends an electronic rear wiper switch status message to the EMIC over the LIN data bus, then the EMIC relays an electronic rear wiper switch request message to the TIPM over the CAN data bus, and the TIPM directs battery current to the rear wiper motor at fixed delay intervals to enable the rear wiper motor intermittent wipe mode.

When the control sleeve of the right multi-function switch is rotated counterclockwise past the INTERMITTENT detent position to the momentary rear WASH position, the SCM sends an electronic rear washer switch status message to the EMIC over the LIN data bus, then the EMIC relays an electronic rear washer switch request message to the TIPM over the CAN data bus, and the TIPM directs battery current to the rear wiper motor and directs battery current and ground to the washer pump/motor unit. These outputs will cause the washer pump motor and the rear wiper motor to operate continuously for as long as the switch is held closed up to approximately 10 seconds. The washer pump is de-energized as soon as the control sleeve is

released, but the rear wiper motor continues to operate for two to three continuous cycles before reverting to the fixed delay interval operation. The TIPM uses a hard wired output from a park switch internal to the rear wiper motor as an additional logic input to monitor the position of the rear wiper blade on the glass and to control the number of continuous wiper sweeps following washer operation.

WARNING: To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, Occupant Classification System (OCS), seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the SRS. Failure to take the proper precautions could result in accidental airbag deployment.

If the front wiper motor operates, but the wipers do not move on the windshield, replace the ineffective front wiper module. If the washer pump/motor operates, but no washer fluid is dispensed on the glass; or, if the wipers operate, but chatter, lift, or do not clear the glass, clean and inspect the front wiper and washer system components as required. See CLEANING and INSPECTION.

The hard wired front wiper and washer system circuits and components may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the front wiper and washer system or the electronic controls or communication between other modules and devices that provide some features of the front wiper and washer system. The most reliable, efficient, and accurate means to diagnose the front wiper and washer system or the electronic controls and communication related to front wiper and washer system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

NOTE: The front wiper and washer switches are integral to the right multi-function switch. The right multi-function switch is hard wired to the left multi-function switch/Steering Control Module (SCM), which communicates with the ElectroMechanical Instrument Cluster (EMIC)/Cab Compartment Node (CCN) over the Local Interface Network (LIN) data bus. Before performing any of the following tests, determine whether the other functions of the right and left multi- function switch/SCM are operational. If only the right multi-function switch functions are inoperative, test and repair the right multi-function switch or the jumper harness between the right and left multi-function switches before attempting to repair the Front Wiper and Washer System. If both the right and left multi-function switch/SCM functions are ineffective, diagnose and repair

that problem before attempting to repair the Front Wiper and Washer System.

WIPER MOTOR DOES NOT 1. Ineffective motor ground      1. Test and repair open wiper motor
OPERATE IN ANY SWITCH circuit.                        ground circuit if required.
POSITION                                              2. Test and repair low speed and high

2. Ineffective motor feed speed feed circuits between TIPM and circuits. front wiper motor if required.

                      3. Ineffective right multi-     3. Test and replace ineffective right
                      function switch.                multi-function switch if required.

4. Use a diagnostic scan tool to test the 4. Ineffective SCM inputs or SCM inputs and outputs. Refer to the outputs. appropriate diagnostic information. 5. Use a diagnostic scan tool to test the 5. Ineffective EMIC (CCN) EMIC (CCN) inputs and outputs. Refer to inputs or outputs. the appropriate diagnostic information. 6. Use a diagnostic scan tool to test the 6. Ineffective TIPM inputs or TIPM inputs and outputs. Refer to the outputs. appropriate diagnostic information. 7. Ineffective wiper motor. 7. Test and replace open or shorted wiper motor as required. 1. Test and repair wiper park switch input 1. Ineffective wiper motor park circuit between TIPM and front wiper switch input circuit. motor if required. WIPERS DO NOT PARK 2. Use a diagnostic scan tool to test the 2. Ineffective TIPM inputs or CORRECTLY TIPM inputs and outputs. Refer to the outputs. appropriate diagnostic information. 3. Ineffective wiper motor park 3. Test and replace ineffective wiper

                      switch.                         motor if required.
WIPER MOTOR OPERATES 1. Ineffective wiper motor.      1. Check amperage draw with linkage
SLOWLY IN ALL SWITCH                                  disconnected from wiper motor crank
POSITIONS                                             arm. Correct draw should be about 6

amperes. If incorrect, refer to the appropriate Possible Cause that follows: 2. Test and repair shorted low and high 2. Amperage draw too low. speed feed circuits if required. 3. Amperage draw too high. 3. With linkage disconnected from wiper motor crank arm check linkage and pivots for binding. If binding is detected, repair or replace front wiper module if required. If no linkage binding detected, replace the front wiper motor if required.

WIPERS RUN AT HIGH    1. Ineffective motor feed       1. Test and repair low speed and high
SPEED WITH SWITCH LOW circuit wiring.                 speed feed circuits between TIPM and
SPEED SELECTED OR AT                                  front wiper motor if required.

1. Ineffective washer pump      1. Test and repair open washer pump
                                ground circuit.                 ground circuit if required.

2. Test and repair washer pump feed 2. Ineffective washer pump circuits between TIPM and washer pump feed circuits. if required.

                                3. Ineffective right multi-     3. Test and replace ineffective right
                                function switch.                multi-function switch if required.

4. Use a diagnostic scan tool to test the 4. Ineffective SCM inputs or WASHER PUMP DOES NOT SCM inputs and outputs. Refer to the outputs. OPERATE appropriate diagnostic information. 5. Use a diagnostic scan tool to test the 5. Ineffective EMIC (CCN) EMIC (CCN) inputs and outputs. Refer to inputs or outputs. the appropriate diagnostic information. 6. Use a diagnostic scan tool to test the 6. Ineffective TIPM inputs or TIPM inputs and outputs. Refer to the outputs. appropriate diagnostic information. 7. Test and replace open or shorted 7. Ineffective washer pump. washer pump if required.

WARNING: To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, Occupant Classification System (OCS), seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the SRS. Failure to take the proper precautions could result in accidental airbag deployment.

If the rear wiper motor operates, but the wiper motor output shaft does not move, replace the ineffective rear wiper motor. If the washer pump/motor operates, but no washer fluid is dispensed on the glass; or, if the wiper operates, but chatters, lifts, or does not clear the glass, clean and inspect the rear wiper and washer system components as required. See CLEANING and INSPECTION.

The hard wired rear wiper and washer system circuits and components may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the rear wiper and washer system or the electronic controls or communication between other modules and devices that provide some features of the rear wiper and washer system. The most reliable, efficient, and accurate means to diagnose the rear wiper and washer system or the electronic controls and communication related to rear wiper and washer system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

NOTE: The rear wiper and washer switches are integral to the right multi-function switch. The right multi-function switch is hard wired to the left multi-function switch/Steering Control Module (SCM), which communicates with the ElectroMechanical Instrument Cluster (EMIC)/Cab Compartment Node (CCN) over the Local Interface Network (LIN) data bus. Before performing any of the following tests, determine whether the other functions of the right and left multi- function switch/SCM are operational. If only the right multi-function switch functions are inoperative, test and repair the right multi-function switch or the jumper harness between the right and left multi-function switches before attempting to repair the Rear Wiper and Washer System. If both the right and left multi-function switch/SCM functions are ineffective, diagnose and repair that problem before attempting to repair the Rear Wiper and Washer System.

WIPER MOTOR DOES NOT 1. Ineffective motor ground     1. Test and repair open wiper motor
OPERATE IN ANY SWITCH circuit.                       ground circuit if required.
POSITION                                             2. Test and repair motor feed circuit

2. Ineffective motor feed between TIPM and rear wiper motor if circuits. required.

                     3. Ineffective right multi-     3. Test and replace ineffective right
                     function switch.                multi-function switch if required.

4. Use a diagnostic scan tool to test the 4. Ineffective SCM inputs or SCM inputs and outputs. Refer to the outputs. appropriate diagnostic information. 5. Use a diagnostic scan tool to test the 5. Ineffective EMIC (CCN) EMIC (CCN) inputs and outputs. Refer to inputs or outputs. the appropriate diagnostic information. 6. Use a diagnostic scan tool to test the 6. Ineffective TIPM inputs or TIPM inputs and outputs. Refer to the outputs. appropriate diagnostic information. 7. Ineffective wiper motor. 7. Test and replace open or shorted wiper motor if required. 1. Test and repair wiper park switch input 1. Ineffective wiper motor park circuit between TIPM and front wiper switch input circuit. motor if required. WIPER DOES NOT PARK 2. Use a diagnostic scan tool to test the 2. Ineffective TIPM inputs or CORRECTLY TIPM inputs and outputs. Refer to the outputs. appropriate diagnostic information. 3. Ineffective wiper motor park 3. Test and replace ineffective wiper

                     switch.                         motor if required.
WIPER MOTOR OPERATES 1. Ineffective wiper motor.     1. Check amperage draw with wiper arm
SLOWLY                                               disconnected from rear wiper motor

output shaft. Correct draw should be about 6 amperes. If incorrect, refer to the appropriate Possible Cause that follows: 2. Test and repair shorted rear wiper

motor signal and fused ignition switch 2. Amperage draw too low. output (run - accessory) circuits if required. 3. Amperage draw too high. 3. With wiper arm disconnected from wiper motor output shaft check for binding between output shaft and rubber grommet in liftgate. If binding is detected, lubricate or replace grommet if required. If no binding is detected, replace the wiper motor if required.

                                1. Ineffective washer pump      1. Test and repair open washer pump
                                ground circuit.                 ground circuit if required.

2. Test and repair washer pump feed 2. Ineffective washer pump circuits between TIPM and washer pump feed circuits. if required.

                                3. Ineffective right multi-     3. Test and replace ineffective right
                                function switch.                multi-function switch if required.

4. Use a diagnostic scan tool to test the 4. Ineffective SCM inputs or WASHER PUMP DOES NOT SCM inputs and outputs. Refer to the outputs. OPERATE appropriate diagnostic information. 5. Use a diagnostic scan tool to test the 5. Ineffective EMIC (CCN) EMIC (CCN) inputs and outputs. Refer to inputs or outputs. the appropriate diagnostic information. 6. Use a diagnostic scan tool to test the 6. Ineffective TIPM inputs or TIPM inputs and outputs. Refer to the outputs. appropriate diagnostic information. 7. Test and replace open or shorted 7. Ineffective washer pump. washer pump if required.

CAUTION: Protect the rubber squeegees of the wiper blades from any petroleum- based cleaners, solvents, or contaminants. These products can rapidly deteriorate the rubber squeegees.

The squeegees of wiper blades exposed to the elements for a long time tend to lose their wiping effectiveness. Periodic cleaning of the squeegees is suggested to remove any deposits of salt or road film. The wiper blades, arms, and windshield glass should only be cleaned using a sponge or soft cloth and windshield washer fluid, a mild detergent, or a non-abrasive cleaner. If the wiper blades continue to leave streaks, smears, hazing, or beading on the glass after thorough cleaning of the squeegees and the glass, the entire wiper blade assembly must be replaced.

CAUTION: Never introduce petroleum-based cleaners, solvents, or contaminants into the washer system. These products can rapidly deteriorate the rubber seals and hoses of the washer system, as well as the rubber squeegees of the wiper blades.

CAUTION: Never use compressed air to flush the washer system plumbing. Compressed air pressures are too great for the washer system plumbing components and will result in further system damage. Never use sharp instruments to clear a plugged washer nozzle or damage to the nozzle orifice and improper nozzle spray patterns will result.

If the washer system is contaminated with foreign material, drain the washer reservoir by removing the washer pump/motor unit from the reservoir. Clean foreign material from the inside of the washer pump inlet filter screen and the washer reservoir using clean washer fluid, a mild detergent, or a non-abrasive cleaner. Flush foreign material from the washer system plumbing by first disconnecting the washer hose from the washer nozzle, then running the washer pump/motor to run clean washer fluid or water through the system. A plugged or restricted washer nozzle should be carefully back-flushed using compressed air. If the washer nozzle obstruction cannot be cleared, replace the washer nozzle.

The squeegee of a wiper blade exposed to the elements for a long time tends to lose its wiping effectiveness. Periodic cleaning of the squeegee is suggested to remove any deposits of salt or road film. The wiper blade, arm, and liftgate glass should only be cleaned using a sponge or soft cloth and windshield washer fluid, a mild detergent, or a non-abrasive cleaner. If the wiper blade continues to leave streaks, smears, hazing, or beading on the glass after thorough cleaning of the squeegees and the glass, the entire wiper blade assembly must be replaced.

CAUTION: Protect the rubber squeegee of the wiper blade from any petroleum-based cleaners, solvents, or contaminants. These products can rapidly deteriorate the rubber squeegee.

If the washer system is contaminated with foreign material, drain the washer reservoir by removing the washer pump/motor from the reservoir. Clean foreign material from the inside of the washer pump/motor inlet filter screen and the washer reservoir using clean washer fluid, a mild detergent, or a non-abrasive cleaner. Flush foreign material from the washer system plumbing by first disconnecting the washer hose from the rear washer nozzle, then running the washer pump/motor to run clean washer fluid or water through the system. A plugged or restricted rear washer nozzle should be carefully back-flushed using compressed air. If the washer nozzle obstruction cannot be cleared, replace the rear washer nozzle.

CAUTION: Never introduce petroleum-based cleaners, solvents, or contaminants into the washer system. These products can rapidly deteriorate the rubber seals and hoses of the washer system, as well as the rubber squeegee of

the wiper blade.

CAUTION: Never use compressed air to flush the washer system plumbing. Compressed air pressures are too great for the washer system plumbing components and will result in further system damage. Never use sharp instruments to clear a plugged washer nozzle or damage to the nozzle orifice and improper nozzle spray patterns will result.

The wiper blades and wiper arms should be inspected periodically, not just when wiper performance problems are experienced. This inspection should include the following points:

1. Carefully inspect the wiper blades for any indications of worn or uneven edges (1), foreign material deposits (2), hardening or cracking (3), deformation or fatigue (4), or splitting (5). Inspect the wiper blade support components and the wiper arms for damage (6) or corrosion. If the wiper arms and blades are

contaminated with any foreign material, clean them and the glass as required. See CLEANING. If a wiper blade or arm is damaged, or if corrosion is evident, replace the affected wiper arm or blade with a new unit. Do not attempt to repair a wiper arm or blade that is damaged or corroded. 2. Carefully lift the wiper blade off of the glass. Note the action of the wiper arm hinge. The wiper arm should pivot freely at the hinge, but with no lateral looseness evident. If there is any binding evident in the wiper arm hinge, or if there is evident lateral play in the wiper arm hinge, replace the wiper arm.

CAUTION: Do not allow the wiper arm to spring back against the glass without the wiper blade in place or the glass may be damaged.

3. Once proper hinge action of the wiper arm is confirmed, check the hinge for proper spring tension. Remove the wiper blade from the wiper arm. Either place a small postal scale between the blade end of the wiper arm and the glass, or carefully lift the blade end of the arm away from the glass using a small fish scale. On vehicles with unequal wiper arm lengths, be certain that measurements on both arms are taken at a point an equal distance from their wiper arm hinge pins. Compare the scale readings between the right and left wiper arms. Replace a wiper arm if it has comparatively lower spring tension, as evidenced by a lower scale reading. 4. After cleaning and inspecting the wiper components and the glass, if the wiper blade still fails to clear the glass without smearing, streaking, chattering, hazing, or beading, replace the wiper blade.

The washer system components should be inspected periodically, not just when washer performance problems are experienced. This inspection should include the following points:

1. Check for ice or other foreign material in the washer reservoir. If contaminated, clean and flush the washer system. See CLEANING. 2. Inspect the washer plumbing for pinched, leaking, deteriorated, or incorrectly routed hoses and damaged or disconnected hose fittings. Replace damaged or deteriorated hoses and hose fittings. Leaking washer hoses can sometimes be repaired by cutting the hose at the leak and splicing it back together using an in- line connector fitting. Similarly, sections of deteriorated hose can be cut out and replaced by splicing in new sections of hose using in-line connector fittings. Whenever routing a washer hose or a wire harness containing a washer hose, it must be routed away from hot, sharp, or moving parts. Also, sharp bends that might pinch the washer hose must be avoided.

The rear wiper blade and wiper arm should be inspected periodically, not just when wiper performance problems are experienced. This inspection should include the following points:

1. Carefully inspect the wiper blade for any indications of worn or uneven edges (1), foreign material deposits (2), hardening or cracking (3), deformation or fatigue (4), or splitting (5). Inspect the wiper blade support components and the wiper arm for damage (6). If the wiper arm and blade are contaminated with any foreign material, clean them and the glass as required. See CLEANING. If the wiper blade or arm is damaged, replace it with a new unit. Do not attempt to repair a wiper arm or blade that is damaged or corroded. 2. Carefully lift the wiper blade off of the glass. Note the action of the wiper arm hinge. The wiper arm should pivot freely at the hinge, but with no lateral looseness evident. If there is any binding evident in the wiper arm hinge, or there is evident lateral play in the wiper arm hinge, replace the wiper arm.

CAUTION: Do not allow the wiper arm to spring back against the glass without the wiper blade in place or the glass may be damaged.

3. Once proper hinge action of the wiper arm is confirmed, check the hinge for proper spring tension. The spring tension of the wiper arm should be sufficient to cause the rubber squeegee to conform to the curvature of the glass. Replace a wiper arm if it has insufficient spring tension to maintain contact between the squeegee and the glass. 4. After cleaning and inspecting the wiper components and the glass, if the wiper blade still fails to clear the glass without smearing, streaking, chattering, hazing, or beading, replace the wiper blade.

The washer system components should be inspected periodically, not just when washer performance problems are experienced. This inspection should include the following points:

1. Check for ice or other foreign material in the washer reservoir. If contaminated, clean and flush the washer system. See CLEANING. 2. Inspect the washer plumbing for pinched, leaking, deteriorated, or incorrectly routed hoses and damaged or disconnected hose fittings. Replace damaged or deteriorated hoses and hose fittings. Leaking washer hoses can sometimes be repaired by cutting the hose at the leak and splicing it back together using an in- line connector fitting. Similarly, sections of deteriorated hose can be cut out and replaced by splicing in new sections of hose using in-line connector fittings. Whenever routing a washer hose or a wire harness containing a washer hose, it must be routed away from hot, sharp, or moving parts. Also, sharp bends that might pinch the washer hose must be avoided.

Switch Mounting Screw Front Wiper Arm 24 18 215 Mounting Nuts Rear Wiper Arm 12 9 106 Mounting Nut Rear Wiper Arm Park 6.5 - 58 Ramp Mounting Nut Front Wiper Module 7.5 - 67 Mounting Screws Front Wiper Module 8 - 72 Mounting Nut Rear Wiper Motor 5.5 - 49 Bracket Mounting Screws

RIGHT MULTI-FUNCTION SWITCH

3. If the switch fails any of the tests, replace the ineffective right multi-function switch as required. If the switch tests okay, but the switch input to the Steering Control Module (SCM) remains incorrect, be certain to check for a short or open in the jumper harness between the right multi-function switch and the

SCM.

The headliner washer hose is integral to the headliner unit and, if ineffective or damaged, the headliner unit must be replaced. However, the headliner hose can be cut and spliced with a plastic in-line connector fitting to facilitate headliner removal without the need to remove the instrument panel. Refer to REMOVAL .

Washer hose is available for service only as roll stock, which must then be cut to length. The molded plastic washer hose fittings cannot be repaired. If these fittings are ineffective or damaged, they must be replaced.

The molded translucent plastic washer fluid reservoir is integral to the engine coolant overflow bottle. This unit sits astride the top of the fan shroud at the front of the engine compartment, with the washer reservoir on the left side of the shroud and the coolant overflow bottle on the right. A single washer fluid reservoir is used for both the front and rear washer systems.

A bright yellow plastic filler cap with a rubber seal and an International Control and Display Symbol icon for Windshield Washer and the text WASHER FLUID ONLY molded into it snaps over the open end of the washer reservoir filler neck. The cap hinges on and is secured to a molded-in hook formation on the top of the reservoir just behind the filler neck when it is removed for inspecting or adjusting the fluid level in the reservoir.

There is a dedicated hole on the top of a sump area and an integral molded receptacle on the lower left facing side of the reservoir provided for the mounting of the washer/pump motor unit. These features allow for mounting of the washer pump/motor unit without the use of fasteners.

The washer reservoir is serviced only as a unit with the engine coolant reserve bottle. The washer reservoir cannot be repaired and, if ineffective or damaged, the coolant reserve bottle/washer reservoir unit must be replaced. The grommet seal/filter screen for the washer pump/motor unit and the filler cap are each available for individual service replacement.

The washer fluid reservoir provides a secure, on-vehicle storage location for a large reserve of washer fluid for operation of the front and rear washer systems. The washer reservoir filler neck provides a clearly marked and readily accessible point from which to add washer fluid to the reservoir. The washer/pump motor unit is located in a sump area near the bottom of the reservoir to be certain that washer fluid will be available to the pump as the fluid level in the reservoir becomes depleted. The washer pump/motor unit is mounted above the lowest position in the sump.

WIPER ARM

1. Disengage the rear wiper arm support from the wiper arm park ramp (2) on the right side of the liftgate just below the rear flip-up glass. 2. Lift the wiper arm and blade away from the liftgate until the wiper arm hinge is in its over-center position. 3. Remove the trim panel from the liftgate inner panel. Refer to REMOVAL . 4. Remove the nut (1) that secures the wiper arm park ramp to the liftgate outer panel. 5. Remove the wiper arm park ramp from the liftgate outer panel.

1. Position the wiper arm park ramp (2) onto the liftgate outer panel. 2. Install and tighten the nut (1) that secures the wiper arm park ramp to the liftgate outer panel. Tighten the nut to 6.5 N.m (58 in. lbs.). 3. Reinstall the trim panel onto the liftgate inner panel. Refer to INSTALLATION . 4. Lower the rear wiper arm and blade and place the wiper arm support onto the wiper arm park ramp.

WIPER BLADE

The rear wiper motor park switch is a single pole, single throw, momentary switch within the wiper motor that is mechanically actuated by the wiper motor transmission components. The park switch alternately closes and opens a path to ground for the rear wiper motor electronic control logic circuitry of the TIPM, depending upon the position of the rear wiper blade on the liftgate flip-up glass. This input allows the electronic logic circuits of the TIPM to control all of the electronic features of rear wiper motor operation and to keep the motor energized long enough to complete its current wipe cycle and park the wiper blade off of the glass after the wiper system or the ignition switch has been turned OFF. The TIPM also receives an external control input from the flip-up glass ajar switch sense circuit. If the TIPM senses that the flip-up glass is ajar, it will not allow the rear wiper motor to operate.

The rear wiper motor is grounded at all times through a take out in the body wire harness that is secured to a ground location in the passenger compartment. The automatic resetting circuit breaker protects the motor from overloads. The rear wiper motor transmission converts the rotary output of the wiper motor to the back and forth wiping motion of the rear wiper arm and blade on the liftgate flip-up glass.

The hard wired inputs and outputs of the rear wiper motor may be diagnosed using conventional diagnostic tools and procedures. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the rear wiper motor or the electronic controls or communication between other modules and devices that provide some features of the rear wiper and washer system. The most reliable, efficient, and accurate means to diagnose the rear wiper motor or the electronic controls and communication related to rear wiper motor operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.