Contents Wiring diagrams Section: Wiper/washer Systems All sections

Wiper System and Washer System Buick LeSabre VIII

Wiper/washer Systems 24 illustrations ~3928 words

FASTENER TIGHTENING SPECIFICATIONS

ApplicationSpecification
MetricEnglish
Washer Solvent Container Nuts6 N.m53 lb in
Windshield Reinforcement Panel Bolts9 N.m80 lb in
Windshield Reinforcement Panel Nuts9 N.m80 lb in
Wiper Arm Nut32 N.m24 lb ft
Wiper Drive System Module Mounting Screws8 N.m71 lb in
Wiper Motor Mounting Screws8 N.m71 lb in

Fastener Tightening Specifications

Scheme 1

Scheme 1: WIPER/WASHER SYSTEM SCHEMATICS

Scheme 2

Scheme 2

Scheme 3

Scheme 3: WIPER/WASHER SYSTEM COMPONENT VIEWS

Scheme 4

Scheme 4

Scheme 5

Scheme 5

Scheme 6

Scheme 6

Scheme 7

Scheme 7: WIPER/WASHER SYSTEM CONNECTOR END VIEWS

Scheme 8

Scheme 8

Scheme 9

Scheme 9

Scheme 10

Scheme 10

DIAGNOSTIC STARTING POINT - WIPER/WASHER SYSTEMS

Begin the system diagnosis by reviewing the system Description and Operation. Reviewing the Description and Operation information will help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the Description and Operation information will also help you determine if the condition described by the customer is normal operation. Refer to SYMPTOMS - WIPER/WASHER SYSTEMS in order to identify the correct procedure for diagnosing the system and where the procedure is located.

SYMPTOMS - WIPER/WASHER SYSTEMS

Note. Review the system operation in order to familiarize yourself with the system functions. Refer to WIPER/WASHER SYSTEM DESCRIPTION & OPERATION .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the Windshield Wiper/Washer System. Refer to «CHECKING AFTERMARKET ACCESSORIES»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system__checking-aftermarket-accessories) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
  3. Inspect the washer fluid reservoir for the proper fluid level.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. «LOW WASHER FLUID INDICATOR MALFUNCTION»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system)
  2. «WASHERS ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system)
  3. «WASHERS INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system)
  4. «WIPERS ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system)
  5. «WIPERS INOPERATIVE - ALL MODES»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system)
  6. «WIPERS INOPERATIVE - ONE OR MORE MODES»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system)
  7. «MOISTURE SENSING FEATURE INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system)

CHECKING AFTERMARKET ACCESSORIES

Do not connect aftermarket accessories into the following circuits

  1. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol.
  2. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol.

Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems.

Possible causes of vehicle problems related to aftermarket accessories include

  1. Power feeds connected to points other than the battery
  2. Antenna location.
  3. Transceiver wiring located too close to vehicle electronic modules or wiring.
  4. Poor shielding or poor connectors on antenna feed line.
  5. Check for recent service bulletins detailing installation guidelines for aftermarket accessories.

Scheme 11

Scheme 11: LOW WASHER FLUID INDICATOR MALFUNCTION

Scheme 12

Scheme 12

Scheme 13

Scheme 13: WASHERS ALWAYS ON

Scheme 14

Scheme 14: WASHERS INOPERATIVE

Scheme 15

Scheme 15: WIPERS ALWAYS ON

Scheme 16

Scheme 16: WIPERS INOPERATIVE - ALL MODES

Scheme 17

Scheme 17

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 7 This step tests for continuity through the 24K ohms resistor in the windshield wiper/washer switch. The connector behind the instrument panel knee bolster is suitable for performing this step.
  2. 8 This step tests for continuity through the delay resistors in the windshield wiper/washer switch. The measured resistance will change in sequence from high to low as the delay speed is increased. The connector behind the instrument panel knee bolster is suitable for performing this step.

Scheme 18

Scheme 18

Scheme 19

Scheme 19

Scheme 20

Scheme 20: MOISTURE SENSING FEATURE INOPERATIVE

WIPER ARM TIP PRESSURE CHECK

  1. Run the wiper arms to the mid-wipe position.
  2. Remove the wiper blades from the wiper arms. Refer to «WIPER ARM BLADE REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
  3. Attach a scale to the end of the wiper arm and measure the force required to lift the wiper arm perpendicular to the windshield to normal working height (height with the blade attached).
  4. Replace the wiper arm if the tip pressure measurement is not within 9-11 Newtons (32-40 Ounces). Refer to «WIPER ARM REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system__wiper-arm-replacement) .

WIPER BLADE ELEMENT CHECK

  1. Remove the wiper blades from the wiper arms. Refer to «WIPER ARM BLADE REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
  2. Look down the length of the blade element.
  3. Replace the wiper blade element if the rubber element which contacts the glass is not on the centerline of the blade 15 degrees. Refer to «WIPER BLADE ELEMENT REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
  4. Install the wiper blades on the wiper arms. Refer to «WIPER ARM BLADE REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .

Removal Procedure

  1. Remove the right front fascia extension. Refer to «FASCIA EXTENSION REPLACEMENT - FRONT»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#bumper-system) in Bumpers.
  2. Disconnect the washer hose from the washer pump.
  3. Disconnect the electrical connector from the washer pump.
  4. Disconnect the electrical connector from the washer solvent level sensor.
  5. Remove the 3 nuts from the washer solvent container.
  6. Remove the washer solvent container from the vehicle.
  7. Remove the washer pump from the washer solvent container.

Installation Procedure

  1. Install the washer pump in the washer solvent container. see scheme 25
  2. Install the washer solvent container on the vehicle. CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  3. Install the 3 nuts. Tighten the 3 nuts to 6 N.m (53 in lbs). (Scheme 24)
  4. Connect the electrical connector to the washer solvent level sensor. (Scheme 23)
  5. Connect the electrical connector to the washer pump.
  6. Connect the washer hose to the washer pump.
  7. Install the right front fascia extension. Refer to «FASCIA EXTENSION REPLACEMENT - FRONT»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#bumper-system) in Bumpers.
  1. Drain the washer solvent container.
  2. Remove the right front fascia extension. Refer to «FASCIA EXTENSION REPLACEMENT - FRONT»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#bumper-system) in Bumpers.
  3. Disconnect the electrical connector from the washer solvent level sensor.
  4. Remove the washer solvent level sensor from the washer solvent container.
  1. Install the washer solvent level sensor in the washer solvent container. see scheme 27
  2. Connect the electrical connector to the washer solvent level sensor. see scheme 26
  3. Install the right front fascia extension. Refer to «FASCIA EXTENSION REPLACEMENT - FRONT»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#bumper-system) in Bumpers.
  4. Fill the washer solvent container.
  1. Drain the washer solvent container.
  2. Remove the right front fascia extension. Refer to «FASCIA EXTENSION REPLACEMENT - FRONT»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#bumper-system) in Bumpers.
  3. Disconnect the washer hose from the washer pump.
  4. Disconnect the electrical connector from the washer pump.
  5. Remove the washer pump from the washer solvent container. see scheme 25
  1. Install the washer pump in the washer solvent container. see scheme 25
  2. Connect the electrical connector to the washer pump. see scheme 28
  3. Connect the washer hose to the washer pump.
  4. Install the right front fascia extension. Refer to «FASCIA EXTENSION REPLACEMENT - FRONT»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#bumper-system) in Bumpers.
  5. Fill the washer solvent container.

WIPER ARM REPLACEMENT

Note. Tools Required: Wiper Arm Puller (J 39822).

Scheme 21

Scheme 21: Removal Procedure
  1. Run the wipers into the Park position.
  2. Disconnect the washer hose from the air inlet grille panel.
  3. Remove the cover from the nut holding the wiper arm.
  4. Remove the wiper arm nut. NOTE: Use the J 39822 in order to remove the wiper arm from the pivot shaft.
  5. Remove the arm from the pivot shaft.
  6. Depress the end of the wiper blade retaining clip and slide the blade off of the wiper arm hook.
  7. Bring the wiper arm hook out through the opening in the wiper blade.

Scheme 22

Scheme 22: Installation Procedure
  1. Install the wiper blade onto the arm by placing the arm hook through the opening in the wiper blade. Slide the arm hook onto the blade retaining clip until it clicks into position. see scheme 30 CAUTION: The wiper system must be in the park position when installing the wiper arms. If the wiper system is not in the park position, damage to the wiper system and the vehicle will occur.
  2. Operate the wiper system and then turn the wiper control switch to the OFF position to assure the wiper system is in the park position. NOTE: Clean the wiper transmission pivot shaft knurls with a wire brush.
  3. Install the wiper arm onto the pivot shaft while aligning the wiper blade with the locating marks on the windshield. If the windshield does not have locating marks, locate the center of the blades to the distance shown up from the base of the windshield. Passenger Side - 112.1 mm (4.41 in) Driver Side - 79.6 mm (3.13 in) CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  4. Install the nut on the wiper arm pivot shaft. Tighten the nut to 32 N.m (24 ft lbs). see scheme 29
  5. Install the cover onto the nut. NOTE: Lubricate the washer hose with windshield washer solvent to ease attachment to the fitting on the air inlet grille panel.
  6. Attach the washer hose to the fitting on the air inlet grille panel.
  7. Operate the wipers and washers and check for proper operation.
  1. Push in the button of the wiper blade clip and remove the wiper blade from the inside radius of the wiper arm.
  2. Bring the wiper arm out through the opening in the wiper blade.
  1. Insert the hook of the wiper arm through the opening in the wiper blade. see scheme 33
  2. Position the wiper blade pivot in the inside radius of the wiper arm hook.
  3. Pull the wiper blade pivot into the wiper arm hook until the pivot locks into the hook.
  4. Operate the wipers and check for proper operation.

Note. Replace the wiper blade element if it is removed from the wiper blade.

  1. Remove the wiper blade from the wiper arm. Refer to «WIPER ARM BLADE REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
  2. Remove the bottom claws of the wiper blade from the notches in the wiper blade element.
  3. Pull the wiper blade element out through the wiper blade claws.

Note. Keep the wiper blade claws in the rubber claw channel of the wiper blade element. Do not allow the claws of the wiper blade to contact the metal spline of the wiper blade element.

  1. Insert the open end of the wiper blade element into the bottom claws of the wiper blade. see scheme 35
  2. Guide the wiper blade element through the wiper blade claw sets.
  3. Engage the bottom claw of the wiper blade into the notches in wiper blade element.
  4. Install the wiper blade onto the wiper arm. Refer to «WIPER ARM BLADE REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system).

WIPER MOTOR REPLACEMENT

Note. Tools Required: Wiper Linkage Separator (J 39232) and Wiper Linkage Installer (J 39529).

Scheme 23

Scheme 23: Removal Procedure
  1. Remove the wiper arms. Refer to «WIPER ARM REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system__wiper-arm-replacement) .
  2. Remove the air inlet grille panel. Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-front-end) in Body Front End.
  3. Remove the three bolts and two nuts retaining the windshield frame reinforcement.
  4. Remove the windshield frame reinforcement.
  5. Pull or push on the wiper transmission linkage to rotate the wiper motor crank arm (2) from the park position (1) to the area opposite the park position (3).
  6. Remove the harness grommet from the hole in the plenum.
  7. Disconnect the wiper motor harness connector.
  8. Push the harness and grommet through the hole in the plenum.
  9. Remove the three screws retaining the wiper system drive module.
  10. Remove the wiper system drive module from the vehicle.
  11. Remove the drive link from the wiper motor crank arm with the J 39232.
  12. Remove the screws retaining the wiper motor.
  13. Remove the wiper motor from the wiper drive system module.
CAUTIONUse the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  1. Install the wiper motor onto the wiper drive system module with the screws. Tighten the screws to 8 N.m (71 in lbs). see scheme 42
  2. Install the drive link onto the wiper motor crank arm with the J 39529.
  3. Lower the wiper module into the upper plenum with the nose of the wiper motor pointing downward.
  4. Rotate the wiper module so that the wiper motor nose points toward the rear of the vehicle.
  5. Install the wiper drive system module with the three screws. Tighten the three screws to 8 N.m (71 in lbs). see scheme 39
  6. Push the harness and grommet through the hole in the plenum.
  7. Connect the wiper motor harness connector.
  8. Install the harness grommet into the hole in the plenum.
  9. Install the windshield frame reinforcement with the three bolts and two nuts. Tighten the three bolts and two screws to 9 N.m (80 in lbs). see scheme 37
  10. Install the air inlet grille panel. Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-front-end) in Body Front End.
  11. Install the wiper arms. Refer to «WIPER ARM REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system__wiper-arm-replacement).
  12. Operate the wipers and check for proper operation.

WIPER TRANSMISSION REPLACEMENT

Note. Tools Required: Wiper Linkage Separator (J 39232) and Wiper Linkage Installer (J 39529).

  1. Remove the wiper arms. Refer to «WIPER ARM REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system__wiper-arm-replacement) .
  2. Remove the air inlet grille panel. Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-front-end) in Body Front End.
  3. Remove the three bolts and two nuts retaining the windshield frame reinforcement.
  4. Remove the windshield frame reinforcement.
  5. Pull or push on the wiper transmission linkage to rotate the wiper motor crank arm (2) from the park position (1) to the area opposite the park position (3).
  6. Remove the harness grommet from the hole in the plenum.
  7. Disconnect the wiper motor harness connector.
  8. Push the harness and grommet through the hole in the plenum.
  9. Remove the three screws retaining the wiper system drive module.
  10. Remove the wiper system drive module from the vehicle.
  11. Remove the drive links from the wiper motor crank arm and the wiper transmission drive shafts with the J 39232.
  12. Remove the screws retaining the wiper motor.
  13. Remove the wiper motor from the wiper drive system module.
CAUTIONUse the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  1. Install the wiper motor onto the wiper drive system module with the screws. Tighten the screws to 8 N.m (71 in lbs). see scheme 50
  2. Install the drive links onto the wiper motor crank arm and the wiper transmission drive shafts with the J 39529.
  3. Lower the wiper module into the upper plenum with the nose of the wiper motor pointing downward. see scheme 48
  4. Rotate the wiper module so that the wiper motor nose points toward the rear of the vehicle.
  5. Install the wiper drive system module with the three screws. Tighten the three screws to 8 N.m (71 in lbs). see scheme 47
  6. Push the harness and grommet through the hole in the plenum.
  7. Connect the wiper motor harness connector.
  8. Install the harness grommet into the hole in the plenum.
  9. Install the windshield frame reinforcement with the three bolts and the two nuts. Tighten the three bolts and two screws to 9 N.m (80 in lbs). see scheme 45
  10. Install the air inlet grille panel. Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-front-end) in Body Front End.
  11. Install the wiper arms. Refer to «WIPER ARM REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system__wiper-arm-replacement).
  12. Operate the wipers and check for proper operation.
  1. Remove the trim cover from the rain sensor module.
  2. Release the windshield coupler clips.
  3. Remove the rain sensor module.
  4. Disconnect the electrical connector from the rain sensor module.
  1. Connect the electrical connector to the rain sensor module. see scheme 53
  2. Install the rain sensor module in the windshield coupler.
  3. Fasten the windshield coupler clips.
  4. Install the trim cover on the rain sensor module. see scheme 52

WIPER CHATTER REPAIR

Some vehicles may exhibit a condition where the windshield wipers chatter and/or wipe unevenly. Several items may contribute to this condition. To completely repair this condition, ALL of the items listed should be tested and repaired as necessary.

  1. Clean the windshield glass.
  2. Clean the wiper blade elements.
  3. Perform the wiper arm pressure test.
  4. Inspect the wiper blade element set.

WINDSHIELD GLASS CLEANING

Clean the windshield with windshield cleaner, GM P/N 1050011 (Canadian P/N 992727) or equivalent. The cleaner should not harm the paint finish or scratch the glass. The glass is clean when the water no longer beads, but sheets across the entire glass surface.

BLADE ELEMENT CLEANING

Lift each blade assembly off of the windshield and clean the element with a cloth saturated with full strength washer solvent. Then rinse the blade assemblies with clear water.

Wiper/Washer System Components

The Wiper/Washer System consists of the following components

  1. Windshield wiper/washer switch.
  2. Windshield wiper motor module.
  3. Windshield wiper motor.
  4. Windshield washer pump motor.
  5. Windshield washer fluid level switch.
  6. Outside moisture sensor.
  7. ACCY 15A fuse.
  8. WSW 30A fuse.

Wiper/Washer System Operation

The windshield wiper motor module is part of the windshield wiper motor cover and controls wiper motor operation. The accessory voltage supply circuit to the windshield wiper motor assembly is used to operate the wiper motor in all modes. The windshield wiper motor is a 2 speed motor and is operated at low speed in all modes except HIGH. The accessory voltage supply circuit to the windshield wiper/washer switch is used to supply the windshield wiper switch signal circuits. The windshield wiper switch signal circuit voltage levels to the wiper motor module determine the wiper motor operating mode.

When the wiper/washer switch is in the LOW position voltage is supplied through a 24K ohm resistor within the switch to the windshield wiper switch signal 2 circuit, and accessory voltage is supplied to the windshield wiper switch signal 1 circuit. The reduced voltage from the wiper switch signal 2 circuit and accessory voltage from the wiper switch signal 1 circuit causes the wiper motor module to close the wiper motor accessory voltage supply circuit to the wiper motor low speed terminal.

Windshield wiper/washer system MIST operation is identical to LOW operation except that the MIST switch is a press and release type. When the wiper switch is moved to the MIST position and released, low speed wiper motor operation is started and will continue until 1 cycle is complete. If the wiper switch is moved to the MIST position and held, the windshield wiper motor will operate in the LOW mode until the switch is released.

Windshield wiper DELAY operation is a low speed wiper motor function with a variable delay interval between the wiper motor cycles. The DELAY interval is controlled through a series of resistors within the wiper/washer switch. During DELAY wiper operation the wiper switch signal 2 circuit is at the same voltage level used for LOW operation, but the wiper switch signal 1 circuit voltage is reduced through the DELAY resistors. The windshield wiper motor module uses a capacitor feed by the wiper switch signal 1 circuit to determine the frequency of the low speed wiper motor cycles. When the wiper switch signal 1 circuit is at the accessory voltage level as in the LOW switch position, the capacitor charges fast causing continuous low speed wiper motor operation. The DELAY switch position indicating the longest interval between wiper motor cycles is the switch position with the highest resistance resulting in low voltage on the wiper switch signal 1 circuit. The low voltage charges the capacitor slowly causing a long delay interval between wiper motor cycles. As the DELAY switch is turned to positions indicating more frequent wiper cycles, the resistance through the wiper/washer switch is reduced and the wiper switch signal 1 circuit voltage increases. When the wiper switch signal 1 circuit voltage increases the capacitor charges faster and the delay interval between wiper motor cycles decreases.

When the wiper/washer switch is in the HIGH position the accessory voltage to the wiper/washer switch is closed to the high speed signal circuit. The accessory voltage on the high speed signal circuit causes the wiper motor module to close the wiper motor accessory voltage supply circuit to the wiper motor high speed terminal. During HIGH speed wiper motor operation the wiper switch signal 1 and signal 2 circuits are at the LOW speed signal voltages, but the LOW speed signal circuit inputs to the wiper motor module are overridden by the active HIGH speed signal circuit.

The windshield wiper/washer system WASH function uses 2 switch contacts within the wiper/washer switch assembly. One switch contact closes the wiper/washer switch accessory voltage supply circuit to the wiper switch signal 2 circuit. Accessory voltage on the wiper switch signal 2 circuit causes the wiper motor module to close the wiper motor accessory voltage supply circuit to the wiper motor low speed terminal. The WASH command on the wiper switch signal 2 circuit will cause the wiper motor to operate at low speed for as long as the switch is held in the closed position and approximately 6 seconds after being released. The other WASH switch contact in the wiper/washer switch is the control circuit to the windshield washer pump. When the WASH switch is in the held in the closed position the wiper/washer switch accessory voltage supply circuit is used to operate the windshield washer pump until the switch is released.

Windshield wiper motor park operation is controlled by the wiper motor module using an input from the park switch within the wiper motor assembly. When the windshield wiper/washer switch is turned to the OFF position while the wiper motor is somewhere in mid-cycle, the wiper motor module will continue to operate the wiper motor until the wipers reach the park position.

Moisture Sensitive Wipers

The outside moisture sensor monitors moisture accumulation on the windshield and uses a windshield wiper/washer switch status input to provide wipe commands to the windshield wiper motor module. The windshield wiper/washer switch delay positions are used to activate the automatic operating mode and to adjust the level of sensitivity to moisture accumulation when commanding a wiper motor wipe cycle. The windshield wiper/washer switch is an input to the windshield wiper motor module. The windshield wiper motor module sends the windshield wiper/washer switch status to the moisture sensor using a PWM voltage signal through the moisture sensor signal 1 circuit. The moisture sensor sends a PWM voltage signal to the wiper motor module through the moisture sensor signal 2 circuit whenever the ignition is in the accessory or run positions, The moisture sensor uses the moisture sensor signal 2 circuit to command wiper motor wipe cycles and to confirm the moisture sensor signal 1 is being received. If at anytime communication between the moisture sensor and wiper motor module is lost, the wiper motor module will use the inputs from the windshield wiper/washer switch in the delay positions to operate the wiper motor at continuous variable delay intervals.

Check Washer Fluid Message

The Check Washer Fluid message is controlled by the instrument panel cluster using an input from the washer fluid level switch. The washer fluid level signal circuit is supplied ignition voltage through a resistor then monitored within the instrument cluster. The washer fluid level switch is normally open so the instrument cluster detects ignition voltage on the washer fluid level signal circuit whenever the washer fluid level is not low. When the washer fluid reaches the point where the driver should be informed that the washer fluid is low, the washer fluid level switch closes. When the washer fluid level switch is closed the washer fluid level signal circuit voltage is pulled low, and the instrument panel displays the Check Washer Fluid message on the driver information center. In order to prevent the Check Washer Fluid message from being displayed while sloshing is occurring in the washer fluid container, the instrument cluster is programed with a 1 minute delay before changing states of the Check Washer Fluid message during an ignition cycle.

Scheme 24

Scheme 24: SPECIAL TOOLS & EQUIPMENT