Wiper System & Washer System Chevrolet Chevy Express H2500

Fastener Tightening Specifications

Fastener Tightening Specifications

Schematic and Routing Diagrams

For Chevy Express, see

1. G1500: «WIPER/WASHER»(ref-154376-S12786910822003080900000)
2. G2500: «WIPER/WASHER»(ref-154377-S15750770552003080900000)
3. G3500: «WIPER/WASHER»(ref-154378-S17316449942003080900000)
4. H1500: «WIPER/WASHER»(ref-154379-S11503684642003080900000)
5. H2500: «WIPER/WASHER»(ref-154380-S37359586722003080900000)

For Cutaway 3500, see WIPER/WASHER .

For RV Cutaway 3500, see WIPER/WASHER .

For GMC Savana, see

1. G1500: «WIPER/WASHER»(ref-154351-S29048359242003080900000)
2. G2500: «WIPER/WASHER»(ref-154352-S24613242862003080900000)
3. G3500: «WIPER/WASHER»(ref-154353-S21479023772003080900000)
4. H1500: «WIPER/WASHER»(ref-154354-S09713557302003080900000)
5. H2500: «WIPER/WASHER»(ref-154355-S01886870972003080900000)

For Savana Camper Special 3500, see WIPER/WASHER .

For Savana Special 3500, see WIPER/WASHER .

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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

Important: Refer to the system description and operation in order to familiarize yourself with the system functions. Refer to Wiper/Washer System Description and Operation .

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the Wiper/Washer System. Refer to «CHECKING AFTERMARKET ACCESSORIES»(/chevrolet/chevy-express-h2500/2003-2003/remont/electrical-component-locations/#wiring-systems-general-information__checking-aftermarket-accessories) .
2. Inspect the easily accessible system components for obvious damage or for conditions which could cause the symptom.
3. Ensure that all mechanical components are operative before diagnosing the electrical portion of the system.

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. «Washers Always On»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system)
2. «Washers Inoperative»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system)
3. «Wipers Always On»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system)
4. «Wipers Inoperative - All Modes»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system)
5. «Wipers Inoperative - One or More Modes»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system)

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Test Description

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

1. 5. This step tests for continuity through the 390 ohm resistor in the windshield wiper/washer switch.
2. 6. This step tests for continuity through the delay resistors in the windshield wiper/washer switch. The measured resistance will change in sequence from low to high as the delay speed is increased.

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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»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-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»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system__wiper-arm-replacement) . Tip Pressure Driver Side - 8.1-9.5 Newtons (29-34 Ounces) Passenger Side - 5.8-7.0 Newtons (21-25 Ounces)

Wiper Blade Element Check

1. Remove the wiper blades from the wiper arms. Refer to «Wiper Arm Blade Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-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»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system) .
4. Install the wiper blades on the wiper arms. Refer to «Wiper Arm Blade Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system) .

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1. Open and support the hood.
2. Remove the upper fender support bar.
3. Remove the bolt from the washer solvent container.
4. Lift the washer solvent container up enough pass the horns in order to access the washer hose and the electrical connector.
5. Disconnect the electrical connector from the washer pump.
6. Disconnect the washer hose from the washer pump.
7. Remove the washer solvent container from the vehicle.
8. Drain the washer solvent reservoir into a suitable container.
9. Remove the washer pump from the washer solvent container.
10. Remove the washer solvent container cap.

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1. Install the washer pump to the new washer solvent container.
2. Install the washer solvent container cap.
3. Connect the electrical connector to the washer pump.
4. Remove the cap on the washer pump and connect the washer hose to the washer pump.
5. Position the washer solvent container into the locating holes in the chassis. CAUTION: Refer to «FASTENER NOTICE»(/chevrolet/chevy-express-h2500/2003-2003/remont/oem-general-information/#gm-vehicles-cautions-notices__fastener-notice) .
6. Install the washer solvent container with the bolt. Tighten Tighten the bolt to 10 N.m (89 lb in).
7. Install the upper fender support bar.
8. Fill the washer solvent container.
9. Close the hood.

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Scheme 25

1. Open and support the hood.
2. Remove the upper fender support.
3. Remove the bolt from the washer solvent container.
4. Lift the washer solvent container up enough past the horns in order to access the washer hose and the electrical connector.
5. Disconnect the electrical connector from the washer pump.
6. Disconnect the washer hose from the washer pump.
7. Place a cap on the washer pump to prevent any washer solvent loss.
8. Remove the washer solvent container from the vehicle.
9. Drain the washer solvent into a suitable container.
10. Remove the washer pump from the washer solvent container.
11. Remove the washer solvent container cap.

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1. Install the new washer pump into the washer solvent container.
2. Install the washer solvent container cap.
3. Connect the electrical connector to the new washer pump.
4. Connect the washer hose to the new washer pump.
5. Position the washer solvent container into the locating holes in the chassis. CAUTION: Refer to «FASTENER NOTICE»(/chevrolet/chevy-express-h2500/2003-2003/remont/oem-general-information/#gm-vehicles-cautions-notices__fastener-notice) .
6. Install the washer solvent container with the bolt. Tighten Tighten the bolt to 10 N.m (89 lb in).
7. Install the upper fender support.
8. Fill the washer solvent container.
9. Close the hood.

Scheme 29

1. Lift the wiper arm from the windshield with the inoperative washer nozzle.
2. Carefully pry the nozzle from the wiper arm.
3. Disconnect the washer hose connection from the washer nozzle.
4. Remove the inoperative washer hose nozzle from the wiper arm.

Scheme 30

1. Secure the washer hose nozzle to the washer nozzle.
2. Lift the wiper arm off the front windshield.
3. Position the washer nozzle to the wiper arm.
4. Secure the washer nozzle clips to the indents on the wiper arm.
5. Release the wiper arm back onto the windshield.
6. Inspect for proper operation.

Scheme 31

1. Open the hood.
2. Disconnect the washer hose from the wiper blades.
3. Remove the air inlet grille panel. Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/chevrolet/chevy-express-h2500/2003-2003/remont/exterior-body-panels/#body-front-end) .
4. Disconnect the washer hose from the air inlet grille panel.
5. Remove the washer hose grommet from the grille panel.
6. Disconnect the washer hose from the plastic cover.
7. Disconnect the washer hose from the washer pump.
8. Remove the washer hose from the vehicle.

Scheme 32

1. Position the washer hose to the vehicle.
2. Lubricate the washer hose ends with washer solvent and install to the washer hose end to the washer pump.
3. Connect the washer hose to the washer pump.
4. Install the washer hose grommet to the slot in the air inlet grille panel.
5. Connect the washer hose to the air inlet grille panel.
6. Connect the washer hose to the plastic panel.
7. Install the air inlet grille. Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/chevrolet/chevy-express-h2500/2003-2003/remont/exterior-body-panels/#body-front-end) .
8. Connect the washer hose to the wiper blades.
9. Fill the washer solvent container. 10. Close the hood.

Wiper Arm Replacement

Tools Required: J 39822 Wiper Arm Puller

Scheme 33

1. Set the wipers in the Park position.
2. Disconnect the washer hose elbow from the air inlet grille panel.
3. Remove the cover from the nut on the wiper arm.
4. Remove the nut from the wiper arm. Important: If rocking the wiper arm fails to loosen the arm from the drive shaft, use a J 39822 or a battery terminal puller to remove the wiper arm
5. Rock the wiper arm back and forth to loosen arm from the drive shaft.
6. Remove the wiper arm from the drive shaft.
7. Remove the wiper blade from the wiper arm. Refer to «Wiper Arm Blade Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system) .

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1. Install the wiper blade onto the wiper arm. Refer to «Wiper Arm Blade Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system) . Important: Do not interchange the LH and RH wiper arms. The wiper arms are stamped with LH and RH.
2. Install the wiper arm onto the drive shaft while aligning the center of the wiper blade to the black locator dots (3) on the lower center windshield (2). CAUTION: Refer to «FASTENER NOTICE»(/chevrolet/chevy-express-h2500/2003-2003/remont/oem-general-information/#gm-vehicles-cautions-notices__fastener-notice) .
3. Install the nut on the wiper arm. Hold the wiper arm near the air inlet grille while tightening the nut. Tighten Tighten the nut to 26 N.m (19 lb ft).
4. Install the cover on the nut.
5. Install the washer hose elbow onto the air inlet grille panel.
6. Operate the wipers and inspect for proper operation.

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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.

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1. Insert 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. Pull the wiper blade pivot into the wiper arm hook until the pivot locks into the hook.
4. Operate the wipers and inspect for proper operation.

Removal Procedure

Important: Replace the wiper blade element if it is removed from the wiper blade.

Scheme 40

1. Remove the wiper blade from the wiper arm. Refer to «Wiper Arm Blade Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-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

Important: 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.

Scheme 41

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»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system) .

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1. Remove the wiper arms. Refer to «Wiper Arm Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system__wiper-arm-replacement) .
2. Remove the air inlet grille panel. Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/chevrolet/chevy-express-h2500/2003-2003/remont/exterior-body-panels/#body-front-end) .
3. Disconnect the electrical connector from the wiper motor.
4. Remove the 3 screws (2) and the wiper motor cover (3) from the wiper motor (1).
5. Remove the wiper motor cover (3).

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1. Install the wiper motor cover onto the wiper motor with the 3 screws. Tighten Tighten the screws to 3 N.m (26 lb in).
2. Connect the electrical connector to the wiper motor.
3. Install the air inlet grille panel. Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/chevrolet/chevy-express-h2500/2003-2003/remont/exterior-body-panels/#body-front-end) .
4. Install the wiper arms. Refer to «Wiper Arm Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system__wiper-arm-replacement) .
5. Operate the wipers and inspect for proper operation.

Wiper Motor Replacement

Tools Required

1. J 39232 Wiper Transmission Separator
2. J 39529 Wiper Transmission Installer

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1. Remove the wiper arms. Refer to «Wiper Arm Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system__wiper-arm-replacement) .
2. Remove the air inlet grille panel. Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/chevrolet/chevy-express-h2500/2003-2003/remont/exterior-body-panels/#body-front-end) .
3. Disconnect the electrical connector from the wiper motor.
4. Remove the 4 bolts retaining the wiper system drive module.
5. Remove the wiper drive system module from the vehicle.
6. Disconnect the drive link from the wiper motor crank arm using the J 39232 .
7. Remove the 2 bolts retaining the wiper motor.
8. Remove the wiper motor from the wiper drive system module.

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1. Install the wiper motor onto the wiper drive system module with the 2 bolts. Tighten Tighten the bolts to 8 N.m (71 lb in).
2. Connect the drive link onto the wiper motor crank arm using the J 39529 .
3. Install the wiper drive system module on the vehicle.
4. Install the 4 bolts. Tighten Tighten the bolts to 8 N.m (71 lb in).
5. Connect the electrical connector to the wiper motor.
6. Install the air inlet grille panel. Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/chevrolet/chevy-express-h2500/2003-2003/remont/exterior-body-panels/#body-front-end) .
7. Install the wiper arms. Refer to «Wiper Arm Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system__wiper-arm-replacement) .
8. Operate the wipers and inspect for proper operation.

Wiper Transmission Replacement

Tools Required

1. J 39232 Wiper Transmission Separator
2. J 39529 Wiper Transmission Installer

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1. Remove the wiper arms. Refer to «Wiper Arm Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system__wiper-arm-replacement) .
2. Remove the air inlet grille panel. Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/chevrolet/chevy-express-h2500/2003-2003/remont/exterior-body-panels/#body-front-end) .
3. Disconnect the electrical connector from the wiper motor.
4. Remove the 4 bolts retaining the wiper system drive module.
5. Remove the wiper system drive module (3) from the vehicle.
6. Disconnect the drive link from the wiper motor crank arm using the J 39232 .
7. Remove the 4 bolts retaining the wiper transmission.
8. Remove the wiper transmission from the wiper drive system module.

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1. Install the wiper transmission onto the wiper drive system module with the 4 bolts. Tighten Tighten the bolts to 7 N.m (62 lb in).
2. Connect the drive link onto the wiper motor crank arm using the J 39529 .
3. Install the wiper drive system module on the vehicle.
4. Install the 4 bolts. Tighten Tighten the bolts to 8 N.m (71 lb in).
5. Connect the electrical connector to the wiper motor.
6. Install the air inlet grille panel. Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/chevrolet/chevy-express-h2500/2003-2003/remont/exterior-body-panels/#body-front-end) .
7. Install the wiper arms. Refer to «Wiper Arm Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system__wiper-arm-replacement) .
8. Operate the wipers and inspect for proper operation.

Wiper Motor Crank Arm Replacement

Tools Required

1. J 39232 Wiper Transmission Separator
2. J 39529 Wiper Transmission Installer

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1. Park the wiper arms.
2. Remove the wiper arms. Refer to «Wiper Arm Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system__wiper-arm-replacement) .
3. Remove the air inlet grille panels (1,2). Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/chevrolet/chevy-express-h2500/2003-2003/remont/exterior-body-panels/#body-front-end) .
4. Remove the wiper motor module assembly. Refer to «Wiper Motor Module Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system) .
5. Disconnect the wiper transmission (2) from the wiper motor crank arm (3) using the J 39232 .
6. Loosen the wiper motor shaft nut (1).
7. Tap on the screw with a soft-faced mallet while holding up on the wiper motor crank arm (3) until the wiper motor crank arm is loose on wiper motor shaft.
8. Remove the nut.
9. Remove the wiper motor crank arm from the wiper motor shaft.

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1. Install the wiper motor crank arm (3) on the wiper motor shaft while maintaining a 4-8 mm (0.157-0.314 in) gap between the wiper motor crank arm and the bracket tab.
2. Install the nut (1) which secures the crank arm to the wiper motor shaft. CAUTION: Refer to «FASTENER NOTICE»(/chevrolet/chevy-express-h2500/2003-2003/remont/oem-general-information/#gm-vehicles-cautions-notices__fastener-notice) .
3. 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 crank arm and repeat installation. Tighten Tighten the wiper motor crank arm nut to 16 N.m (12 lb ft).
4. Install the wiper transmission on the wiper motor crank arm using the J 39529 .
5. Install the wiper motor module assembly. Refer to «Wiper Motor Module Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system) .
6. Install the air inlet grille panels (1,2). Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/chevrolet/chevy-express-h2500/2003-2003/remont/exterior-body-panels/#body-front-end) .
7. Install the wiper arms. Refer to «Wiper Arm Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system__wiper-arm-replacement) .
8. Operate the windshield wipers and inspect for proper operation.

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1. Remove the wiper motor fuse. The wiper motor fuse is located in the instrument panel electrical center.
2. Remove the wiper arm assemblies. Refer to «Wiper Arm Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system__wiper-arm-replacement) .
3. Remove the air inlet grille (1,2). Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/chevrolet/chevy-express-h2500/2003-2003/remont/exterior-body-panels/#body-front-end) .
4. Remove the wiper motor module mounting bolts.
5. Disconnect the wiper motor electrical connector.
6. Remove the wiper motor module from the vehicle.

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1. Place the wiper motor module (3) into the vehicle.
2. Connect the wiper motor module electrical connector.
3. Align the wiper motor module studs to the cowl vent. CAUTION: Refer to «FASTENER NOTICE»(/chevrolet/chevy-express-h2500/2003-2003/remont/oem-general-information/#gm-vehicles-cautions-notices__fastener-notice) .
4. Install the nuts. Tighten Tighten the nuts to 10 N.m (89 lb in).
5. Install the air inlet grille (1,2). Refer to «AIR INLET GRILLE PANEL REPLACEMENT»(/chevrolet/chevy-express-h2500/2003-2003/remont/exterior-body-panels/#body-front-end) .
6. Install the wiper arm assemblies. Refer to «Wiper Arm Replacement»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system__wiper-arm-replacement) .
7. Install the wiper motor fuse.

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. Perform the wiper arm pressure test. Refer to «Wiper Arm Tip Pressure Check»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system__wiper-arm-tip-pressure-check) .
2. Inspect the wiper blade element set. Refer to «Wiper Blade Element Check»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system__wiper-blade-element-check) .
3. Clean the wiper blade elements. Refer to «Blade Element Cleaning»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system__blade-element-cleaning) .
4. Clean the windshield glass. Refer to «Windshield Glass Cleaning»(/chevrolet/chevy-express-h2500/2003-2003/remont/wiperwasher-systems/#wiper-system-washer-system__windshield-glass-cleaning) .

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 water.

Windshield Wiper/Washer System Components

The windshield wiper/washer system consists of the following components

1. Windshield wiper/washer switch
2. Windshield wiper motor
3. Windshield washer pump
4. Windshield washer relay
5. FRT WIPER 25A fuse
6. W/S WASH 15A fuse

Wiper/Washer System Operation

The windshield wiper motor module is part of the windshield wiper motor cover and controls the windshield wiper motor and washer pump 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 provides the power for operating the wiper motor and the wiper motor module.

The windshield wiper switch supply voltage circuit is a 12-volt reference from the wiper motor module to the wiper/washer switch. The WASH, MIST, LOW, and DELAY modes are controlled by the windshield wiper/washer switch through a series of internal resistors, and the switch position determines the point on the resistor assembly where the reference voltage is applied. The windshield wiper switch signal 1 circuit supplies the signal voltage from the switch assembly to the wiper motor module which determines the operating mode.

Windshield wiper motor high speed operation is controlled by the windshield wiper/washer switch through the windshield wiper switch high signal circuit. The windshield wiper switch high signal circuit is supplied 12 volts by the wiper motor module and when the wiper/washer switch is turned to the HIGH position the windshield wiper switch high signal circuit is grounded. The windshield washer pump is controlled by the wiper motor module through the windshield washer relay. The windshield washer relay coil and switch is supplied battery positive voltage, and during WASH mode the wiper motor module grounds the washer relay control circuit energizing the relay. While the relay coil is energized battery positive voltage to the switch side of the relay is supplied to the washer pump control circuit.

Scheme 78

See also:
• CHECKING AFTERMARKET ACCESSORIES
• TESTING FOR INTERMITTENT AND POOR CONNECTIONS
• FASTENER NOTICE
• AIR INLET GRILLE PANEL REPLACEMENT
• Symptoms - Wiper/Washer Systems
• Wiper/Washer System Description and Operation
• Wiper Arm Replacement
• Wiper Arm Tip Pressure Check
• Wiper Blade Element Check
• Blade Element Cleaning
• Windshield Glass Cleaning