how to fix the rear wiper not working in Toyota Highlander XU70 (2020-Present)

Toyota Highlander XU70 (2020-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

562 words

Problem Statement

Learn how to diagnose and fix the rear wiper not working issue in Toyota Highlander XU70 (2020-present). Step-by-step guide with diagnostic procedures.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shock or short circuits.

Symptoms

•Rear wiper does not operate when activated
•No sound or movement from the wiper mechanism
•Wiper fluid does not spray from the rear nozzle
•Dashboard warning light related to wipers may illuminate
•Wiper blade appears to be intact but is non-functional

Diagnostic Steps

1
Inspect the rear wiper fuse using the fuse box diagram to locate and check the wiper fuse for continuity.
2
Use an OBD-II scanner to check for any related error codes that might indicate electrical issues.
3
Verify the rear wiper switch operation by testing with a multimeter for continuity when engaged.
4
Check the wiring harness for signs of damage or disconnection at the rear wiper motor.
5
Test the rear wiper motor directly by applying a 12V power supply to see if it activates.

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

•OBD-II scanner
•Multimeter
•Fuse puller or pliers
•Socket set
•Screwdrivers (flathead and Phillips)

Parts Required

•Rear wiper fuse (if blown)
•Rear wiper switch (if faulty)
•Rear wiper motor (if defective)

Related Faults

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Diagnostic Steps

1
Inspect the rear wiper fuse using the fuse box diagram to locate and check the wiper fuse for continuity.
2
Use an OBD-II scanner to check for any related error codes that might indicate electrical issues.
3
Verify the rear wiper switch operation by testing with a multimeter for continuity when engaged.
4
Check the wiring harness for signs of damage or disconnection at the rear wiper motor.
5
Test the rear wiper motor directly by applying a 12V power supply to see if it activates.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the ignition is turned off.
Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace the Fuse

Locate the fuse box, usually found under the dashboard or in the engine compartment.
Remove the fuse for the rear wiper using a fuse puller or pliers.
Inspect the fuse for breaks or discoloration; replace with the same amperage if faulty.

3. Test and Replace the Rear Wiper Switch

Remove the steering column cover to access the wiper switch.
Disconnect the wiring harness from the switch.
Use a multimeter to check for continuity across the switch terminals when activated.
If failed, replace the switch by removing it from the column and installing a new one.

4. Inspect the Wiring and Connectors

Follow the wiring harness from the rear wiper motor to ensure there are no frayed wires or loose connections.
Repair or replace any damaged wiring or connectors as necessary.

5. Replace the Rear Wiper Motor

If the motor is confirmed faulty, remove the rear wiper arm by loosening the nut securing it.
Unbolt the motor from the mounting bracket and disconnect the electrical connector.
Install the new motor by reversing the removal steps, ensuring a secure connection and proper alignment.