my Toyota Highlander XU70 (2020-Present) rear window wiper not working what could be wrong

Toyota Highlander XU70 (2020-Present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

511 words

Problem Statement

Learn how to diagnose and fix the rear window wiper not working on your 2020-Present Toyota Highlander XU70. Step-by-step guide with tools and parts needed.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•Rear window wiper does not operate when activated
•Wiper motor making no sound when switch is engaged
•No fluid spray when the rear wiper is activated
•Front wipers may operate normally, indicating a separate issue
•Possible dashboard warning light for wiper malfunction (if equipped)

Diagnostic Steps

1
Check the rear wiper switch operation by testing it with a multimeter to ensure it is sending power.
2
Inspect the rear wiper fuse in the fuse box for any signs of a blown fuse.
3
Use a multimeter to test for voltage at the wiper motor connector when the switch is activated.
4
Inspect the wiring harness leading to the rear wiper motor for any visible damage or disconnections.
5
Test the rear wiper motor directly by applying power to it to see if it operates independently of the switch.

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
•Fuse puller or pliers
•Screwdriver set
•Torque wrench (if applicable for motor installation)

Parts Required

•Replacement wiper motor (if faulty)
•Replacement fuse (if blown)

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Diagnostic Steps

1
Check the rear wiper switch operation by testing it with a multimeter to ensure it is sending power.
2
Inspect the rear wiper fuse in the fuse box for any signs of a blown fuse.
3
Use a multimeter to test for voltage at the wiper motor connector when the switch is activated.
4
Inspect the wiring harness leading to the rear wiper motor for any visible damage or disconnections.
5
Test the rear wiper motor directly by applying power to it to see if it operates independently of the switch.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the ignition is off.
Disconnect the battery to ensure safety while working with electrical components.

2. Check and Replace Fuse

Locate the fuse box (usually under the dashboard or in the engine compartment).
Remove the rear wiper fuse using a fuse puller or pliers.
Inspect the fuse for continuity; replace it if it is blown with the same amperage rating.

3. Inspect and Repair Wiring

Visually inspect the wiring harness for any frays, cuts, or corrosion.
If damage is found, repair or replace the affected wires using appropriate connectors and heat shrink tubing.

4. Test and Replace Wiper Motor (if necessary)

Disconnect the wiper motor from the harness.
Use a multimeter to test the motor by connecting it directly to the battery; if it does not operate, replace it.
To replace the motor, remove the mounting screws, detach the motor from the wiper arm, and install the new motor in reverse order.

5. Reassemble and Reconnect

Reconnect the battery and ensure all connections are secure.
Reinstall any panels or components removed during the process.