Part 2A

Fig.17 Front Wiper Module:

FRONT WIPER MODULE
The front wiper module is secured with screws to the cowl top panel and concealed within the cowl plenum area beneath the cowl plenum cover/grille panel. The ends of the wiper pivot shafts that protrude through dedicated openings in the cowl plenum cover/grille panel to drive the wiper arms and blades are the only visible components of the front wiper module. The front wiper module consists of the following major components:
- Bracket - The front wiper module bracket consists of a long tubular steel main member that has a stamped pivot bracket formation near each end where the two wiper pivots are secured. A stamped steel mounting plate for the wiper motor is secured with welds near the center of the main member. A reinforcement and stud plate with a rubber-isolated mounting bracket extends from the cowl plenum side of the dash panel to the motor mounting plate to provide additional support.
- Crank Arm - The front wiper motor crank arm is a stamped steel unit with a slotted hole on the driven end that is secured to the wiper motor output shaft with a nut, and a ball stud secured to the drive end.
- Linkage - The two front wiper linkage members are each constructed of stamped steel. A connecting link with a plastic socket-type bushing in the right end, and a plastic sleeve-type bushing in the left end, is fit over the pivot ball studs to join the two pivots.
The wiper drive link has a plastic socket-type bushing on each end. One end of the drive link is snap-fit over the exposed end of the longer left pivot ball stud, while the other end is snap-fit over the ball stud on the wiper motor crank arm.
- Motor - The front wiper motor is secured with three screws to the motor mounting plate near the center of the wiper module bracket and is protected by a rubber boot. The wiper motor output shaft passes through a hole in the module bracket, where a nut secures the wiper motor crank arm to the motor output shaft. The two-speed permanent magnet wiper motor features an integral transmission, an internal park switch, and an internal automatic resetting circuit breaker.
- Pivots - The two front wiper pivots are secured to the ends of the wiper module bracket. The crank arms that extend from the bottom of the pivot shafts each have a ball stud on their end. The left pivot ball stud is longer than the ball stud on the right pivot. The upper end of each pivot shaft where the wiper arms will be fastened each has an externally serrated drum secured to it.
The front wiper module cannot be adjusted or repaired. If any component of the module is faulty or damaged, the entire front wiper module unit must be replaced. The reinforcement bracket and stud plate are available for service replacement.

The front wiper module operation is controlled by the vehicle operator through battery current inputs received by the wiper motor from the right multi- function switch on the steering column. The wiper motor speed is controlled by current flow to either the low speed or the high speed set of brushes. The 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 the wiper park switch sense circuit to ground or to battery current, depending upon the position of the wipers on the glass. This feature allows the motor to complete its current wipe cycle after the wiper system has been turned OFF, and to park the wiper blades in the lowest portion of the wipe pattern. The automatic resetting circuit breaker protects the motor from overloads. The wiper motor crank arm, the two wiper linkage members, and the two wiper pivots mechanically convert the rotary output of the wiper motor to the back and forth wiping motion of the wiper arms and blades on the glass.

Windshield Wiper Switch and Washer Switch:

RIGHT MULTI-FUNCTION SWITCH
The right multi-function switch is mounted on the right side of the steering column. The only visible part of the right multi-function switch is the control stalk that extends from the right side of the steering column just below the steering wheel. The right multi-function switch control stalk has both nomenclature and international control symbols on it, which identify its many functions. On the end of the control stalk is a plastic knob with a rounded end and a knurled band near its base to allow it to be easily rotated. The remainder of the right multi-function switch is concealed beneath the steering column shrouds. The switch housing and its control stalk are constructed of molded black plastic. A single connector receptacle containing six terminal pins is located on the back of the switch housing and connects the switch to the vehicle electrical system through a take out and connector of the instrument panel wire harness. The switch is secured to the upper steering column housing by a single screw. The right multi-function switch is the primary control for the front wiper and washer system, and contains switches, circuitry, an intermittent wipe logic circuit, and an internal wiper motor relay to provide the following features:
- Continuous Wipe Modes - The internal circuitry of the right multi-function switch provides two continuous wipe cycles, low speed or high speed.
- Intermittent Wipe Mode - The internal circuitry of the right multi-function switch provides an intermittent wipe mode with adjustable delay intervals between wipe cycles of about one second to about fifteen seconds.
- Washer Mode - When the front washer system is activated with the right multi-function switch while the front wiper system is operating, washer fluid will be dispensed onto the windshield glass through the washer nozzles for as long as the front washer pump is energized.
- Wipe-After-Wash Mode - The internal circuitry of the right multi-function switch provides a wipe-after-wash feature which, if the front wipers are turned OFF, will operate the front washer pump/motor and the front wipers for as long as the washer system is activated, then provide one or two additional wipe cycles after the washer system is deactivated before parking the front wiper blades near the base of the windshield.
The right multi-function switch cannot be adjusted or repaired. If any function of the switch is faulty, or if the switch is damaged, the entire switch unit must be replaced.

Moving the control stalk of the right multi-function switch up or down to one of four detent positions actuates the triple pole, quadruple throw front wiper switch and selects the OFF, Low, High, or Delay front wiper operating mode. Pulling the control stalk towards the steering wheel actuates the momentary single pole, single throw front washer switch and operates the front washer pump/motor. Rotating the knob on the end of the control stalk actuates the front wiper delay variable resistor and selects the wiper delay interval when the Delay mode is selected with the wiper switch. The intermittent wipe logic circuit within the right multi-function switch monitors inputs from the front wiper switch, the front washer switch, the front wiper delay variable resistor, and the front wiper motor park switch. The programming of the logic circuit then determines the proper outputs to the front wiper motor. The low current logic circuit controls the high current front wiper motor by pulling the control coil of the integral wiper motor relay to ground. The wiper motor relay switches a circuit that feeds battery current to the low speed brush of the front wiper motor.

When the ignition switch is in the Accessory or ON positions, battery current from a fuse in the Power Distribution Center (PDC) is provided to the wiper and washer system circuit breaker in the Junction Block (JB). This automatic resetting circuit breaker provides battery current through a fused ignition switch output (run-acc) circuit to the right multi-function switch. The electronic intermittent wipe logic circuit receives a logic ground through the instrument panel wire harness from a take out with an eyelet terminal connector located under a nut on a ground stud on the back of the lower instrument panel reinforcement, near the left instrument panel end bracket. Refer to the owner's manual in the vehicle glove box for more information on the features, use and operation of the right multi-function switch.

Fig.28 Washer Reservoir:

WASHER FLUID LEVEL SWITCH
The washer fluid level switch is a single pole, single throw reed-type switch mounted near the front of the washer reservoir, above the two washer pump/motors. Only the molded plastic switch mounting flange and connector receptacle are visible when the switch is installed in the reservoir. A short nipple formation extends from the inner surface of the switch mounting flange, and a barb on the nipple near the switch mounting flange is press-fit into a rubber grommet seal installed in the mounting hole of the reservoir. A small plastic float pivots on the end of a bracket that extends from the switch nipple formation. Within the float is a small magnet, which actuates the reed switch. The washer fluid level switch cannot be adjusted or repaired. If faulty or damaged, the switch must be replaced.

The washer fluid level switch uses a pivoting, oblong float to monitor the level of the washer fluid in the washer reservoir. The float contains a small magnet. When the float pivots, the changing proximity of its magnetic field will cause the contacts of the small, stationary reed switch to open or close. When the fluid level in the washer reservoir is at or above the float level, the float moves to a vertical position and the switch contacts open. When the fluid level in the washer reservoir falls below the pivoting float, the float moves to a horizontal position and the switch contacts close. The switch is connected to the vehicle electrical system through a dedicated take out and connector of the headlamp and dash wire harness. The switch is grounded at all times through another take out of the headlamp and dash wire harness with a single eyelet terminal connector that is secured under a ground screw to the top of the left front fender wheel housing in the engine compartment. When the switch closes, it provides a ground path for the ElectroMechanical Instrument Cluster (EMIC) through the low washer fluid sense circuit. The EMIC uses this input and internal programming to determine when to illuminate the washer fluid indicator lamp. Diagnosis of the washer fluid level switch is included with the diagnosis for the washer fluid indicator lamp. (Refer to INSTRUMENT CLUSTER/WASHER FLUID INDICATOR - DIAGNOSIS AND TESTING).

Fig.31 Washer Reservoir:

WASHER RESERVOIR
A single washer fluid reservoir is used for both the standard front and optional rear washer systems. The molded plastic washer reservoir is concealed between the left front inner and outer fender panels, above and in front of the left front wheel house. The only visible component of the washer reservoir is the removable filler neck and cap unit. The molded plastic filler neck has a barbed nipple that snaps into the reservoir through a rubber grommet seal from the engine compartment side of the left inner fender shield, over the top of the left front wheel house. A bright yellow plastic filler cap with 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 filler neck. An integral bail strap on the cap keeps it secured to the filler neck when the cap is removed.

In addition to the dedicated hole in the washer reservoir for the filler neck, there are also separate, dedicated holes near the front of the reservoir provided for the mounting of the front and rear washer/pump motor units and the washer fluid level switch. On models not equipped with the optional rear washer system, the rear washer pump/motor mounting hole in the washer reservoir is sealed with a plastic plug. The washer reservoir is positioned to the left front fender inner shield by two integral molded hooks that are engaged in two slotted holes in the left front fender ledge. Two screws are then installed from the engine compartment side on the inner fender shield to secure the reservoir to the vehicle. The left front fender wheel house splash shield must be removed to access the washer reservoir for service.

The washer reservoir cannot be repaired and, if faulty or damaged, it must be replaced. The reservoir filler neck, grommet seal, and filler cap are each available for service replacement.

The washer fluid reservoir provides a secure, on-vehicle storage location for a large reserve of washer fluid for operation of the standard front and optional 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 front and rear washer/pump motor units are located in a sump area near the front of the reservoir to be certain that washer fluid will be available to the pumps as the fluid level in the reservoir becomes depleted. The front washer pump/motor unit is mounted in the lowest position in the sump so that the front washers will operate even after the rear washer system will no longer operate.

Fig.1 Rear Wiper & Washer System:

REAR WIPERS/WASHERS
An electrically operated fixed interval intermittent rear wiper and washer system is optional factory-in-stalled 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 onto the rear wiper arm near the base of the liftgate glass. The rear washer plumbing includes a hose routed along the underside of the rear wiper arm and a hose fitting that is integral to the rear wiper motor output shaft bezel. The remainder of the washer system plumbing, including a check valve, are concealed within and routed through the interior of the vehicle.
- 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 optional rear washer pump is located above the standard front washer pump mounting hole.
- Rear Wiper and Washer Switch - The rear wiper and washer switch is secured to the accessory switch bezel near the bottom of the instrument panel center stack area on the instrument panel. Only the switch rocker button is visible through the lower opening of the instrument panel center bezel, the remainder of the switch is concealed behind the accessory switch bezel within the instrument panel. The rear wiper and washer switch contains switches to control both the rear wiper and washer system.
- Rear Wiper Arm - The single rear wiper arm is secured by a nut directly to the rear wiper module output shaft, which extends through 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, and is parked near the bottom of the liftgate glass when the rear wiper system is not in operation.
- Rear Wiper Module - The rear wiper module 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. The rear wiper module includes the module bracket, the rear wiper motor, the rear wiper module circuitry, a diode, and the rear wiper motor park switch.
- 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 reservoir is concealed between the left inner fender shield and the left outer fender panel, above and forward of the left front wheel housing.

Features of the rear wiper and washer system include the following:
- Washer Mode - The rear wiper and washer switch rocker must first be moved to the Wipe detent in order to access the momentary Wash position and operate the rear washer system. When the Wash position is selected, 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 remains energized. When the rear wiper and washer switch rocker 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 a normal fixed intermittent wipe cycle. The rear wiper and washer switch rocker must be manually moved to the OFF position following rear washer operation to turn the rear wiper system OFF.
- Wiper Mode - When the rear wiper and washer switch rocker is moved to the Wipe position, the rear wiper will be operated in a fixed interval, intermittent wipe mode until the switch is moved to the Wash or OFF positions.

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.

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 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 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 rear wiper and washer switch located in the instrument panel accessory switch bezel, just below the heater and air conditioner controls. Moving the switch rocker downward to a detent position selects the rear wiper system fixed intermittent cycle operating mode. Moving the switch rocker downward to the momentary position past the wipe mode detent activates the rear washer pump/motor, which dispenses washer fluid onto the liftgate glass through the rear washer nozzle and operates the rear wiper system in the fixed cycle mode for as long as the washer switch is closed plus about three wiper sweeps.

When the ignition switch is in the ON position, battery current from a fuse in the Power Distribution Center (PDC) is provided to the rear wiper and washer system fuse in the Junction Block (JB). This fuse provides battery current through a fused ignition switch output (run) circuit to the rear wiper and washer switch. Within the rear wiper and washer switch, this battery current is fed through a trace on the switch circuit board and through a separate fused ignition switch output (run) circuit to the rear wiper module circuit board and one fixed contact of the rear wiper motor park switch. When the rear wiper and washer switch Wipe mode is selected, the Wipe position circuitry within the switch directs a battery current rear wiper motor control signal input to the rear wiper module circuit board, which causes the rear wiper motor to run at a fixed intermittent cycle. When the rear wiper and washer switch Wash mode is selected, the Wash position circuitry within the switch directs battery current to the rear washer pump and to the rear washer motor control signal input of the rear wiper module circuit board, which causes the wiper motor to run at a fixed cycle for as long as the Wash mode is selected plus about three additional fixed wipe cycles.

The rear wiper module circuit board controls the switching of battery current to the rear wiper motor brush, which controls wiper motor operation. The intermittent wipe and wipe-after-wash features of the rear wiper and washer system are both provided by the rear wiper module circuit board. In order to provide the intermittent wipe feature, the circuit board also monitors the wiper switch state, and the rear wiper motor park switch state. In order to provide the wipe-after-wash feature, the circuit board monitors the rear washer switch state and the rear wiper motor park switch state. The circuit board monitors the rear wiper motor operation through battery current pulse inputs received through a wiper park switch sense circuit. This arrangement allows the circuit board to count the number of wiper sweeps after the washer motor control signal input has ceased during fixed cycle wiper operation, and to calculate the proper timing to begin the next wiper blade sweep during fixed intermittent cycle wiper operation.

When the OFF position of the rear wiper and washer switch is selected, one of three events is possible. The event that will occur depends upon the position of the wiper blade on the liftgate glass and the mode the wiper module is operating under at the moment that the OFF position is selected. If the wiper blade is in the down position on the glass and is operating in fixed intermittent cycle mode when the OFF position is selected, the park switch is closed to the park switch sense circuit input of the circuit board and the wiper motor ceases to operate. If the wiper blade is not in the down position on the glass and is operating in fixed intermittent cycle mode when the OFF position is selected, the park switch is closed to battery current through the fused ignition switch output (run) circuit of the rear wiper module. The park switch directs this battery current to the rear wiper motor brush causing the motor to continue running until the wiper blade is in the down position on the glass and the park switch opens the battery current feed to the rear wiper motor brush and is again closed to the park switch sense circuit. The third event occurs with the rear wiper operating in the wipe-after-wash mode when the OFF position is selected, in which case the circuit board will continue to run the wiper motor until the completion of about three wiper blade sweeps before the rear wiper blade is parked.

Refer to the owner's manual in the vehicle glove box for more information on the features and operation of the rear wiper and washer system.