How can I troubleshoot a non-functioning rear windshield wiper in my 2021 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2 hours

Time

medium

Difficulty

medium

Severity

3 min read

597 words

Problem Statement

Learn how to troubleshoot and repair a non-functioning rear windshield wiper on your 2021 Toyota Highlander with our step-by-step guide.

Affected Component

rear windshield wiper

Estimated Time

2 hours

Symptoms

•Rear windshield wiper does not operate when activated.
•Wiper motor may make a clicking sound or be completely silent.
•Wiper may move erratically or stop mid-operation if it was working intermittently before.

Diagnostic Steps

1
Check the Wiper Switch
2
Inspect the Fuses
3
Check Wiring and Connections
4
Test the Rear Wiper Motor

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 (Phillips and flathead)
•Trim removal tool
•Torque wrench
•Diagnostic scan tool (optional, for advanced diagnostics)

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Solution

Certainly! Troubleshooting a non-functioning rear windshield wiper on your 2021 Toyota Highlander involves a systematic approach to diagnose the issue. Below are the detailed steps, including symptoms, diagnostic steps, necessary tools, and repair instructions.

Required Tools

Multimeter
Screwdriver set (Phillips and flathead)
Trim removal tool
Torque wrench
Diagnostic scan tool (optional, for advanced diagnostics)
Replacement parts (if needed, such as wiper motor or switch)

Step 1: Check the Wiper Switch

Test the Wiper Control:
- Turn the ignition on without starting the engine.
- Activate the rear wiper using the stalk or button.
- Listen for any sounds from the rear wiper motor.
Inspect for Electrical Power:
- Using a multimeter, check for voltage at the rear wiper switch.
- If you have power (around 12V), the switch is functional; otherwise, replace the switch.

Step 2: Inspect the Fuses

Locate the Fuse Box:
- The fuse box for the Highlander is typically located under the dashboard or in the engine compartment.
Check the Rear Wiper Fuse:
- Consult the owner’s manual for the exact fuse location and specifications.
- Inspect the fuse visually or use a multimeter to check for continuity.
- If blown, replace the fuse with the same amperage.

Step 3: Check Wiring and Connections

Inspect Wiring:
- Use the trim removal tool to access the rear wiper motor.
- Check for any loose, corroded, or damaged wiring connections.
- Ensure that the connector to the rear wiper motor is securely connected.

Step 4: Test the Rear Wiper Motor

Remove the Rear Wiper Arm:
- Use a screwdriver to remove the nut holding the wiper arm.
- Gently pull the wiper arm off the spindle.
Test the Motor Directly:
- Disconnect the motor’s electrical connector.
- Using the multimeter, check for voltage at the motor connector while operating the wiper switch.
- If there is voltage but the motor does not operate, the motor is likely faulty.
Direct Power Test:
- Connect the motor directly to a 12V power source (ensure correct polarity).
- If the motor does not operate, it needs replacement.

Repair Instructions

Replacing the Rear Wiper Motor

Purchase the Correct Replacement Motor:
- Obtain the correct rear wiper motor for the 2021 Toyota Highlander from a dealership or trusted auto parts store.
Remove the Old Motor:
- Disconnect the battery to ensure safety.
- Remove the rear wiper arm as previously described.
- Unscrew the mounting bolts securing the wiper motor.
- Disconnect the electrical connector from the motor.
- Remove the old motor from the vehicle.
Install the New Motor:
- Position the new rear wiper motor in place.
- Secure it with the mounting bolts (tighten to manufacturer specifications using a torque wrench).
- Reconnect the electrical connector.
- Reinstall the rear wiper arm and secure it with the nut.
Reconnect the Battery:
- Reconnect the negative battery terminal.
Test the System:
- Start the vehicle and activate the rear wiper to ensure proper function.

Conclusion

By following these structured steps, you should effectively diagnose and repair the non-functioning rear windshield wiper on your 2021 Toyota Highlander. If issues persist after following these steps, consider consulting a professional automotive technician for further diagnostics.