how to fix my Toyota Highlander’s windshield wipers that won’t turn off

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

540 words

Problem Statement

Learn how to diagnose and fix windshield wipers that won't turn off in Toyota Highlander. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery to prevent electrical shock.

Symptoms

•Windshield wipers operate continuously, regardless of switch position
•Wipers do not respond to intermittent or low-speed settings
•No sound from the wiper motor when attempting to turn off
•Possible blowing fuse if wipers are stuck in operation
•Potential water leaks inside the vehicle if wipers are malfunctioning during rain

Diagnostic Steps

1
Inspect the wiper switch for physical damage or wear.
2
Use an OBD-II scanner to check for any related error codes.
3
Check the fuse for the windshield wipers in the fuse box.
4
Test the wiper motor for continuity using a multimeter.
5
Inspect the wiper relay for proper operation.
6
Verify wiring connections for corrosion or damage leading to the 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

•OBD-II scanner
•Multimeter
•Socket set
•Torque wrench
•Flathead screwdriver

Parts Required

•Wiper switch (if defective)
•Wiper relay (if defective)
•Wiper motor (if defective)

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Symptoms

•Windshield wipers operate continuously, regardless of switch position

•Wipers do not respond to intermittent or low-speed settings

•No sound from the wiper motor when attempting to turn off

•Possible blowing fuse if wipers are stuck in operation

•Potential water leaks inside the vehicle if wipers are malfunctioning during rain

Diagnostic Steps

1
Inspect the wiper switch for physical damage or wear.
2
Use an OBD-II scanner to check for any related error codes.
3
Check the fuse for the windshield wipers in the fuse box.
4
Test the wiper motor for continuity using a multimeter.
5
Inspect the wiper relay for proper operation.
6
Verify wiring connections for corrosion or damage leading to the wiper motor.

Solution

1. Preparation

Gather necessary tools and parts. Ensure the vehicle is parked on a flat surface and the ignition is off.
Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, flathead screwdriver.
Safety Warnings: Disconnect the battery to prevent electrical shock.

2. Inspect and Replace the Wiper Switch

Remove the steering column cover using a flathead screwdriver.
Disconnect the electrical connector from the wiper switch.
Test the wiper switch with a multimeter for continuity in each position.
If defective, replace with a new wiper switch, ensuring the connector is securely attached.
Reassemble the steering column cover.

3. Check and Replace the Wiper Relay

Locate the wiper relay in the fuse box (refer to owner’s manual for exact location).
Remove the relay carefully, checking for any signs of burnt contacts.
Test the relay using a multimeter; if faulty, replace it with a new relay.
Reinstall the relay in the fuse box.

4. Test and Replace the Wiper Motor (if necessary)

Disconnect the wiper motor electrical connector.
Use a multimeter to check for power at the connector when the wiper switch is activated.
If there is no power, further investigate wiring. If power is present but the motor does not operate, replace the wiper motor.
To replace the motor, remove the wiper arms, unscrew the motor from its mount, and disconnect it.
Install the new motor, reversing the removal steps and ensuring it is securely mounted.