Wiper System and Washer System Buick Century VI

Specifications

Fastener Tightening Specifications

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

Scheme 6

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

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the Windshield Wiper/Washer System.
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 in Wiring Systems.

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/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system)
2. «Washers Always On»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system)
3. «Washers Inoperative»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system)
4. «Wipers Always On»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system)
5. «Wipers Inoperative-All Modes»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system)
6. «WIPERS INOPERATIVE-One or More Modes»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system)

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Test Description

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

1. 8. 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. 9. 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 17

Scheme 18

Scheme 19

Scheme 20

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/century/vi-1997-2005/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 measurement is not within the specification. Refer to «WIPER ARM REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) . Tip Pressure 8.3-10.1 N (30-36 oz)
5. Install the wiper blades on the wiper arms. Refer to «WIPER ARM BLADE REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .

Scheme 21

1. Remove the wiper blades from the wiper arms. Refer to «WIPER ARM BLADE REPLACEMENT»(/buick/century/vi-1997-2005/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 deflected more than 15 degrees from the centerline of the blade. Refer to «WIPER BLADE ELEMENT REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
4. Install the wiper blades on the wiper arms. Refer to «WIPER ARM BLADE REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .

Scheme 22

Scheme 23

Scheme 24

1. Drain the washer solvent from the washer solvent container.
2. Remove the washer solvent container filler neck. Refer to «WASHER SOLVENT CONTAINER FILLER NECK REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
3. Remove the right headlamp assembly. Refer to HEADLAMP ASSEMBLY OR HEADLAMP BULB AND/OR CORNERING, SIDEMARKER, PARK, TURN SIGNAL BULB REPLACEMENT in Lighting Systems.
4. Remove the washer solvent container screws.
5. Remove the front fender liner. Refer to FRONT FENDER LINER REPLACEMENT in Body Front End.
6. Disconnect the washer pump hose.
7. Disconnect the washer pump electrical connector.
8. Disconnect the washer solvent level sensor electrical connector.
9. Remove the washer solvent container bracket screw.
10. Remove the washer solvent container from the right frame rail.

Scheme 25

Scheme 26

Scheme 27

1. Position the washer solvent container to the right frame rail. NOTE: Refer to «FASTENER NOTICE»(/buick/century/vi-1997-2005/remont/oem-general-information/#gm-vehicles-cautions-notices__fastener-notice) in Cautions and Notices.
2. Install the washer solvent container bracket screw. Tighten Tighten the screw to 10 N.m (89 lb in).
3. Connect the washer solvent level sensor electrical connector.
4. Connect the washer pump electrical connector.
5. Connect the washer pump hose.
6. Install the front fender liner. Refer to FRONT FENDER LINER REPLACEMENT in Body Front End.
7. Install the washer solvent container screws. Tighten Tighten the screws to 10 N.m (89 lb in).
8. Install the right headlamp assembly. Refer to HEADLAMP ASSEMBLY OR HEADLAMP BULB AND/OR CORNERING, SIDEMARKER, PARK, TURN SIGNAL BULB REPLACEMENT in Lighting Systems.
9. Install the washer solvent container filler neck. Refer to «WASHER SOLVENT CONTAINER FILLER NECK REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
10. Fill the washer solvent container with washer solvent.

Scheme 28

1. Drain the washer solvent from the washer solvent container.
2. Remove the right front fender liner. Refer to FRONT FENDER LINER REPLACEMENT in Body Front End.
3. Disconnect the washer solvent container level sensor electrical connector.
4. Using a small flat-bladed tool, remove the washer solvent level sensor from the washer solvent container.
5. Using a small flat-bladed tool, remove the seal from the washer solvent container.

Scheme 29

1. Position the seal to the washer solvent container, pressing in until fully seated.
2. Position the washer solvent level sensor to the washer solvent container, pressing in until fully seated.
3. Connect the washer solvent level sensor electrical connector.
4. Install the right front fender liner. Refer to FRONT FENDER LINER REPLACEMENT in Body Front End.
5. Fill the washer solvent container with washer solvent.

Scheme 30

1. Open the Hood.
2. Remove the .
3. Remove the washer solvent container filler neck from the washer solvent container.

Scheme 31

1. Position the washer solvent container filler neck to the washer solvent container, pressing in until fully seated.
2. Install the washer solvent container filler neck push-in retainer.
3. Close the hood.

Scheme 32

1. Drain the washer solvent from the washer solvent container.
2. Remove the front fender liner. Refer to FRONT FENDER LINER REPLACEMENT in Body Front End.
3. Disconnect the washer pump electrical connector.
4. Disconnect the washer pump hose.
5. Using a small flat-bladed tool, remove the washer pump from the washer solvent container.
6. Using a small flat-bladed tool, remove the seal from the washer solvent container.

Scheme 33

1. Position the seal to the washer solvent container, pressing in until fully seated.
2. Position the washer pump to the washer solvent container pressing, in until fully seated.
3. Connect the washer pump electrical connector.
4. Connect the washer pump hose.
5. Install the front fender liner. Refer to FRONT FENDER LINER REPLACEMENT in Body Front End.
6. Fill the washer solvent container with washer solvent.

Scheme 34

Scheme 35

Scheme 36

1. Open the hood.
2. Remove the right front fender liner. Refer to FRONT FENDER LINER REPLACEMENT in Body Front End.
3. Disconnect the washer hose from the washer pump.
4. Lower the vehicle.
5. Disconnect the washer hose from the wiper arms.
6. Disconnect the washer hose from the air inlet grille panel.
7. Pull the washer hose pump end out alongside the right front inner fender and into the engine compartment.
8. Remove the washer hose from the vehicle.

Scheme 37

Scheme 38

Scheme 39

1. Position the washer hose to the vehicle.
2. Route the washer hose pump end down alongside the right front inner fender and into the right front inner fender area.
3. Connect the washer hose to the air inlet grille panel.
4. Connect the washer hose to the wiper arms.
5. Raise the vehicle.
6. Connect the washer hose to the washer pump.
7. Install the right front fender liner. Refer to FRONT FENDER LINER REPLACEMENT in Body Front End.
8. Close the hood.

Removal Procedure

Tools Required

J 39822 Wiper Arm Puller. See Special Tools and Equipment .

Scheme 40

1. Turn the ignition ON.
2. Turn the wiper switch to DELAY.
3. Turn the ignition OFF when the wiper arms are paused at the bottom of the wipe pattern.
4. Disconnect the washer hose from the wiper arm.
5. Remove the wiper arm nut cover.
6. Remove the wiper arm nut.
7. Using the J 39822, remove the wiper arm from the wiper transmission.

Scheme 41

1. Install the wiper arms onto the wiper transmission.
2. Hold the measuring device at a 90 degree angle to the wiper blade while maintaining the following distances: Right arm: 97-107 mm (3.82-4.21 in) from the end of the wiper arm to the air inlet screen. Left arm: 125-147 mm (4.92-5.78 in) from the wiper blade tip to the air inlet screen. NOTE: Refer to «FASTENER NOTICE»(/buick/century/vi-1997-2005/remont/oem-general-information/#gm-vehicles-cautions-notices__fastener-notice) in Cautions and Notices.
3. Install the wiper arm nut. Tighten Tighten the nut to 30 N.m (22 lb ft).
4. Install the wiper arm nut cover.
5. Connect the washer hose to the wiper arm.
6. Operate the windshield wipers and inspect for proper operation.

Scheme 42

Scheme 43

1. Turn the ignition ON.
2. Turn the wiper switch to the DELAY position.
3. Turn the ignition OFF when the windshield wipers are in the midwipe position.
4. Press the wiper blade clip button in to release the wiper blade from the inside radius of the wiper arm.
5. Remove the wiper arm out through the opening in the wiper blade.

Scheme 44

Scheme 45

1. Install the hook of the wiper arm through the opening in the wiper blade.
2. Position the wiper blade pivot in the inside radius of the wiper arm hook.
3. Press the wiper blade pivot into the wiper arm hook until the pivot locks into the hook.
4. Operate the windshield wipers and inspect for proper operation.

1. Remove the wiper blade from the wiper arm. Refer to «WIPER ARM BLADE REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
2. Remove the bottom claws (2) of the wiper blade (1) from the notches in the wiper blade element (3).
3. Pull the wiper blade element (3) out through the wiper blade claws (2).

Installation Procedure

Scheme 46

1. Insert the open end of the wiper blade element (3) into the bottom claws of the wiper blade (2).
2. Guide the wiper blade element (3) through the wiper blade (1) claw sets.
3. Engage the bottom claw (2) of the wiper blade (1) into the notches in wiper blade element (3).
4. Install the wiper blade onto the wiper arm. Refer to «WIPER ARM BLADE REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .

Scheme 47

1. Remove the air inlet grille panel. Refer to AIR INLET GRILLE PANEL REPLACEMENT in Body Front End.
2. Remove the wiper drive system module. Refer to «WIPER DRIVE SYSTEM MODULE REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
3. Remove the wiper motor cover screws.
4. Remove the wiper motor cover from the wiper motor.

Scheme 48

1. Position the wiper motor cover to the wiper motor. NOTE: Refer to «FASTENER NOTICE»(/buick/century/vi-1997-2005/remont/oem-general-information/#gm-vehicles-cautions-notices__fastener-notice) in Cautions and Notices.
2. Install the wiper motor cover screws. Tighten Tighten the screws to 2 N.m (18 lb in).
3. Install the wiper drive system module. Refer to «WIPER DRIVE SYSTEM MODULE REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
4. Install the air inlet grille panel. Refer to AIR INLET GRILLE PANEL REPLACEMENT in Body Front End.
5. Operate the windshield wipers and inspect for proper operation.

Tools Required

J 38778 Door Trim Pad and Garnish Clip Remover. See Special Tools and Equipment .

Scheme 49

1. Remove the air inlet grille Panel. Refer to AIR INLET GRILLE PANEL REPLACEMENT in Body Front End.
2. Using the J 38778, remove the wiper motor water deflector push-in retainer.
3. Remove the wiper motor water deflector from the wiper drive system module.

Scheme 50

1. Position the wiper motor water deflector to the wiper drive system module.
2. Install the wiper motor water deflector push-in retainer.
3. Install the air inlet grille panel. Refer to AIR INLET GRILLE PANEL REPLACEMENT in Body Front End.

Tools Required

1. J 39232 Wiper Transmission Separator. See «Special Tools and Equipment»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
2. J 39529 Wiper Transmission Installer. See «Special Tools and Equipment»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .

Scheme 51

Scheme 52

1. Remove the air inlet grille panel. Refer to AIR INLET GRILLE PANEL REPLACEMENT in Body Front End.
2. Remove the wiper motor water deflector. Refer to «WIPER MOTOR WATER DEFLECTOR REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
3. Using the J 39232 , disconnect the wiper transmission from the wiper motor crank arm to aid in the removal of the wiper drive system module.
4. Remove the wiper drive system module screws.
5. Disconnect the wiper motor electrical connector.
6. Remove the wiper drive system module from the vehicle.

Scheme 53

1. Position the wiper drive system module to the vehicle.
2. Connect the wiper motor electrical connector. NOTE: Refer to «FASTENER NOTICE»(/buick/century/vi-1997-2005/remont/oem-general-information/#gm-vehicles-cautions-notices__fastener-notice) in Cautions and Notices.
3. Install the wiper drive system screws. Tighten Tighten the screws to 10 N.m (89 lb in).
4. Using the J 39529, Install the wiper transmission to the wiper motor crank arm.
5. Install the wiper motor water deflector. Refer to «WIPER MOTOR WATER DEFLECTOR REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
6. Install the air inlet grille panel. Refer to AIR INLET GRILLE PANEL REPLACEMENT in Body Front End.
7. Inspect the wipers for proper operation.

Scheme 54

1. Remove the air inlet grille panel. Refer to AIR INLET GRILLE PANEL REPLACEMENT in Body Front End.
2. Remove the wiper motor crank arm. Refer to «WIPER MOTOR CRANK ARM REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
3. Remove the wiper drive system module. Refer to «WIPER DRIVE SYSTEM MODULE REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
4. Remove the wiper motor screws.
5. Remove the wiper motor from the wiper drive system module.
6. Remove the shaft seal and the water shield from the wiper motor.

Scheme 55

1. Install the water shield and shaft seal onto the wiper motor.
2. Position the wiper motor to the wiper drive system module. NOTE: Refer to «FASTENER NOTICE»(/buick/century/vi-1997-2005/remont/oem-general-information/#gm-vehicles-cautions-notices__fastener-notice) in Cautions and Notices.
3. Install the wiper motor screws. Tighten Tighten the screws to 7 N.m (62 lb in).
4. Install the wiper drive system module. Refer to «WIPER DRIVE SYSTEM MODULE REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
5. Install the wiper motor crank arm. Refer to «WIPER MOTOR CRANK ARM REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
6. Install the air inlet grille panel. Refer to AIR INLET GRILLE PANEL REPLACEMENT in Body Front End.

Scheme 56

1. Remove the air inlet grille panel. Refer to AIR INLET GRILLE PANEL REPLACEMENT in Body Front End.
2. Remove the wiper drive system module. Refer to «WIPER DRIVE SYSTEM MODULE REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
3. Remove the wiper transmission caps.
4. Remove the wiper transmission screws.
5. Remove the wiper transmission from the wiper drive system module tube frame.

Scheme 57

1. Position the wiper transmission to the wiper drive system module tube frame. NOTE: Refer to «FASTENER NOTICE»(/buick/century/vi-1997-2005/remont/oem-general-information/#gm-vehicles-cautions-notices__fastener-notice) in Cautions and Notices.
2. Install wiper transmission screws. Tighten Tighten the screws to 9 N.m (80 lb in).
3. Install the wiper transmission caps.
4. Install the wiper drive system module. Refer to «WIPER DRIVE SYSTEM MODULE REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
5. Install the air inlet grille panel. Refer to AIR INLET GRILLE PANEL REPLACEMENT in Body Front End.
6. Operate the windshield wipers and inspect for proper operation.

Tools Required

1. J 39232 Wiper Transmission Separator. See «Special Tools and Equipment»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
2. J 39529 Wiper Transmission Installer. See «Special Tools and Equipment»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .

Scheme 58

Scheme 59

1. Remove the air inlet grille panel. Refer to AIR INLET GRILLE PANEL REPLACEMENT in Body Front End.
2. Remove the wiper motor water deflector. Refer to «WIPER MOTOR WATER DEFLECTOR REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
3. Using the J 39232 disconnect the wiper transmission from the wiper motor crank arm.
4. Remove the wiper motor crank arm cover.
5. Remove the wiper motor crank arm screw.
6. Remove the wiper motor crank arm from the wiper motor.

Scheme 60

Scheme 61

Scheme 62

1. Position the wiper motor crank arm onto the wiper motor.
2. Measure the gap between wiper motor crank arm and the bracket tab. If the gap is not 4 -8 mm (0.157-0.314 in), remove the wiper motor crank arm and repeat installation. NOTE: Refer to «FASTENER NOTICE»(/buick/century/vi-1997-2005/remont/oem-general-information/#gm-vehicles-cautions-notices__fastener-notice) in Cautions and Notices.
3. Install the wiper motor crank arm screw. Tighten Tighten the screw to 16 N.m (12 lb ft).
4. Install the wiper motor crank arm cover.
5. Using the J 39529, install the wiper transmission to the wiper motor crank arm.
6. Install the air inlet grille panel. Refer to AIR INLET GRILLE PANEL REPLACEMENT in Body Front End.
7. Install the wiper motor water deflector. Refer to «WIPER MOTOR WATER DEFLECTOR REPLACEMENT»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
8. Operate the windshield wipers and inspect for proper operation.

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. Refer to «WINDSHIELD GLASS CLEANING»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system__windshield-glass-cleaning) .
2. Clean the wiper blade elements. Refer to «BLADE ELEMENT CLEANING»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system__blade-element-cleaning) .
3. Perform the wiper arm tip pressure test. Refer to «WIPER ARM TIP PRESSURE CHECK»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
4. Inspect the wiper blade element set. Refer to «WIPER BLADE ELEMENT CHECK»(/buick/century/vi-1997-2005/remont/wiperwasher-systems/#wiper-system-and-washer-system) .

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. WIPER 25A fuse

Wiper/Washer System Operation

The windshield wiper motor module is part of the windshield wiper motor cover and controls wiper motor operation. 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 motor assembly is used to operate the wiper motor in all of the low speed modes. The accessory voltage supply circuit to the windshield wiper/washer switch is used to supply the windshield wiper switch signal circuits and the wiper motor high speed circuit.

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 wiper motor high speed circuit. The accessory voltage on the high speed circuit is supplied to the wiper motor module and is used to operate the wiper motor at high speed. 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 have no effect on wiper motor high speed operation.

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.

Low Washer Fluid Indicator

The low washer fluid indicator 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 level 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 cluster illuminates the LOW WASHER FLUID indicator. In order to prevent the LOW WASHER FLUID indicator from flashing due to sloshing in the washer fluid container, the instrument cluster is programed with a 1 minute delay before changing states of the LOW WASHER FLUID indicator during an ignition cycle.

Scheme 63

See also:
• TESTING FOR INTERMITTENT AND POOR CONNECTIONS
• FASTENER NOTICE
• SYMPTOMS-WIPER/WASHER SYSTEMS
• WIPER/WASHER SYSTEM DESCRIPTION AND OPERATION
• WINDSHIELD GLASS CLEANING
• BLADE ELEMENT CLEANING