What can cause the windshield wipers to stop working on a 2020 Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

4 min read

677 words

Problem Statement

Learn about the common causes and diagnostic steps for windshield wiper failures on the 2020 Toyota Highlander, including symptoms and repair instructions.

Affected Component

windshield wipers

Estimated Time

1-3 hours

Symptoms

•Wipers do not operate when activated.
•Wipers may operate intermittently, but fail to function at higher speeds.
•Wipers may stop mid-operation.
•Wipers may operate, but do not return to the 'home' position.
•No sound from the wiper motor when activated.

Diagnostic Steps

1
Check for any visible damage to the wiper arms or blades.
2
Inspect the wiper linkage for any disconnections or damage.
3
Locate the fuse box and inspect the fuse related to the windshield wipers.
4
Use a multimeter to test the wiper switch for continuity.
5
Locate the wiper relay in the fuse box and test for continuity.
6
Disconnect the wiper motor connector and check for voltage at the connector.

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
•Wrench Set
•Screwdrivers
•Pliers
•Replacement Parts

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Diagnostic Steps

1
Check for any visible damage to the wiper arms or blades.
2
Inspect the wiper linkage for any disconnections or damage.
3
Locate the fuse box and inspect the fuse related to the windshield wipers.
4
Use a multimeter to test the wiper switch for continuity.
5
Locate the wiper relay in the fuse box and test for continuity.
6
Disconnect the wiper motor connector and check for voltage at the connector.

Solution

Possible Causes

Faulty Wiper Motor: The motor that drives the wipers may be malfunctioning.
Blown Fuse: A blown fuse in the wiper circuit can prevent operation.
Wiper Relay Failure: A defective relay can interrupt power to the wiper motor.
Faulty Wiper Switch: The switch that controls the wipers may be defective.
Electrical Issues: Broken wiring or poor connections can disrupt the circuit.
Wiper Linkage Problems: The mechanical linkage that connects the motor to the wipers may be damaged or disconnected.

Tools Required

Multimeter: For testing electrical continuity and voltage.
Fuse Puller: To safely remove fuses.
Wrench Set: For removing any bolts or fasteners.
Screwdrivers: For removing covers or components.
Pliers: For handling wiring and connectors.
Replacement Parts: Fuses, relays, or wiper motor (if needed).

Repair Instructions

1. Replace Blown Fuse (If Applicable)

Remove the blown fuse and replace it with a new one of the same amperage.
Test the wipers to see if they function.

2. Replace Wiper Relay (If Applicable)

Remove the faulty relay from the fuse box.
Install the new relay in the same position.
Test the wipers again.

3. Replace Wiper Motor (If Applicable)

Disconnect the battery to avoid any electrical shorts.
Remove the wiper arms using a puller if they are stuck.
Unbolt the wiper motor from its mount (typically 2-3 bolts).
Disconnect the electrical connector.
Install the new motor by reversing the removal steps.
Reconnect the battery and test the wipers.

4. Repair Wiring Issues (If Applicable)

If broken wires are found, strip the insulation and splice them back together, ensuring good electrical contact.
Use heat-shrink tubing or electrical tape to insulate the repair.

5. Replace Wiper Switch (If Applicable)

Remove the steering column cover (if necessary).
Disconnect the switch connector.
Remove the screws/bolts holding the switch in place.
Install the new switch and reconnect the connector.
Reassemble the steering column cover.

Final Testing

After performing any repairs, test the windshield wipers in all modes (off, intermittent, low speed, high speed) to ensure proper functionality. Additionally, check that the wipers return to the "home" position when turned off. If issues persist, further diagnostic steps may be required to identify other potential problems in the electrical system.