How can I fix the issue of the windshield wipers not functioning in my 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-3 hours

Time

medium

Difficulty

medium

Severity

4 min read

616 words

Problem Statement

Learn how to diagnose and repair windshield wiper issues on your 2020 Toyota Highlander with detailed steps and required tools.

Affected Component

windshield wipers

Estimated Time

2-3 hours

Symptoms

•Wipers do not move at all when activated.
•Wipers move intermittently or erratically.
•Wipers operate but do not return to the resting position.
•Wipers make a grinding noise.
•Washer fluid does not spray.

Diagnostic Steps

1
Check Wiper Blades: Ensure that the wiper blades are not frozen to the windshield or damaged.
2
Inspect Wiper Arms: Look for any signs of bending or damage to the wiper arms.
3
Examine Fuse: Locate the fuse box and check the wiper fuse for continuity.
4
Listen for Motor Activation: Turn on the wipers and listen for a clicking sound from the wiper motor.
5
Inspect Wiper Switch: Verify that the wiper switch on the steering column is functioning correctly.
6
Use a multimeter to check for voltage at the wiper motor connector when the wipers are activated.
7
Inspect Wiring Harness: Look for frayed or broken wires in the wiper motor harness.
8
Check Connectors: Ensure that all connectors are clean and secure.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Multimeter
•Screwdriver set
•Pliers
•Wrench set
•Replacement fuse (if needed)
•Replacement wiper motor (if needed)

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Diagnostic Steps

1
Check Wiper Blades: Ensure that the wiper blades are not frozen to the windshield or damaged.
2
Inspect Wiper Arms: Look for any signs of bending or damage to the wiper arms.
3
Examine Fuse: Locate the fuse box and check the wiper fuse for continuity.
4
Listen for Motor Activation: Turn on the wipers and listen for a clicking sound from the wiper motor.
5
Inspect Wiper Switch: Verify that the wiper switch on the steering column is functioning correctly.
6
Use a multimeter to check for voltage at the wiper motor connector when the wipers are activated.
7
Inspect Wiring Harness: Look for frayed or broken wires in the wiper motor harness.
8
Check Connectors: Ensure that all connectors are clean and secure.

Solution

Issue: Windshield Wipers Not Functioning on 2020 Toyota Highlander

Step 1: Visual Inspection

Check Wiper Blades: Ensure that the wiper blades are not frozen to the windshield or damaged.
Inspect Wiper Arms: Look for any signs of bending or damage to the wiper arms.
Examine Fuse: Locate the fuse box and check the wiper fuse for continuity.

Step 2: Check Wiper Motor Operation

Listen for Motor Activation: Turn on the wipers and listen for a clicking sound from the wiper motor.

Step 3: Electrical System Check

Inspect Wiper Switch: Verify that the wiper switch on the steering column is functioning correctly.
Test with Multimeter: Use a multimeter to check for voltage at the wiper motor connector when the wipers are activated.

Step 4: Check Wiring and Connectors

Inspect Wiring Harness: Look for frayed or broken wires in the wiper motor harness.
Check Connectors: Ensure that all connectors are clean and secure.

Tools Required

Multimeter
Screwdriver set
Pliers
Wrench set
Replacement fuse (if needed)
Replacement wiper motor (if needed)

Repair Instructions

Repair Option 1: Replace Blown Fuse

Locate Fuse Box: Open the driver’s side door and find the fuse box cover under the dashboard.
Remove the Cover: Use your screwdriver to remove the cover.
Identify Wiper Fuse: Refer to the fuse diagram on the cover or owner’s manual to locate the wiper fuse.
Test the Fuse: Pull the fuse out using pliers and check for continuity with a multimeter.
Replace if Necessary: If the fuse is blown, replace it with a fuse of the same amperage.

Repair Option 2: Replace Wiper Switch

Disconnect Battery: Remove the negative terminal of the battery to prevent any electrical shorts.
Remove Steering Column Covers: Use a screwdriver to take off the lower steering column cover.
Disconnect Wiper Switch Connector: Locate the wiper switch connector and disconnect it.
Unscrew Wiper Switch: Remove screws holding the wiper switch in place and carefully take it out.
Install New Wiper Switch: Position the new switch and secure it with screws, then reconnect the wiring harness.

Repair Option 3: Replace Wiper Motor

Disconnect Battery: As always, start by disconnecting the negative terminal.
Remove Wiper Arms: Using a wrench, remove the retaining nuts from the wiper arms and carefully pull them off the splines.
Access Wiper Motor: Remove the plastic cowl covering the wiper motor by unscrewing the retaining screws and gently prying it off.
Disconnect Wiper Motor: Unplug the electrical connector from the motor and remove the mounting bolts holding the motor in place.
Install New Wiper Motor: Position the new motor and secure it with bolts. Reconnect the electrical connector.
Reassemble Wiper Arms: Reinstall the wiper arms, ensuring they are aligned properly.
Test Wipers: Reconnect the battery, turn on the wipers, and check for proper operation.

Final Checks

After completing repairs, run a final check on the wipers in all modes (intermittent, low, and high).
Ensure that the washer fluid function operates correctly.

By following these detailed steps, you should be able to diagnose and fix the windshield wiper issue on your 2020 Toyota Highlander effectively. If problems persist after these repairs, further diagnosis may be needed, possibly involving the vehicle’s body control module.