my Toyota Highlander Third Generation (2014-2019) wipers won't turn off, how can I fix this

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

516 words

Problem Statement

Learn how to diagnose and fix windshield wipers that won't turn off in a 2014-2019 Toyota Highlander. 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 prevent shocks or shorts.

Symptoms

•Wipers continuously running regardless of switch position
•Wiper motor noise persists even when wipers should be off
•Possible activation of wipers when turning on headlights
•Intermittent wiper function not responding correctly
•Dashboard warning lights may illuminate

Diagnostic Steps

1
Check the wiper switch for any signs of physical damage or malfunction.
2
Use an OBD-II scanner to check for any related error codes that may indicate electrical faults.
3
Inspect the wiper relay for any signs of sticking or failure.
4
Test the voltage at the wiper motor connector with a multimeter to ensure proper power supply.
5
Examine the wiring harness for any signs of damage or corrosion that could affect the wiper system.
6
Inspect the wiper control module (if equipped) for any faults or communication issues.

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
•Flathead screwdriver
•Electrical cleaner

Parts Required

•Wiper switch (if faulty)
•Wiper relay (if faulty)
•Wiper motor (if faulty)
•Wiring harness (if damaged)

Related Faults

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Diagnostic Steps

1
Check the wiper switch for any signs of physical damage or malfunction.
2
Use an OBD-II scanner to check for any related error codes that may indicate electrical faults.
3
Inspect the wiper relay for any signs of sticking or failure.
4
Test the voltage at the wiper motor connector with a multimeter to ensure proper power supply.
5
Examine the wiring harness for any signs of damage or corrosion that could affect the wiper system.
6
Inspect the wiper control module (if equipped) for any faults or communication issues.

Solution

1. Preparation

Gather tools: OBD-II scanner, multimeter, socket set, flathead screwdriver, and electrical cleaner.
Disconnect the negative terminal of the battery to avoid electrical shorts.

2. Inspect and Test Wiper Switch

Remove the steering column cover using the socket set.
Disconnect the wiper switch connector.
Test the wiper switch with a multimeter for continuity in all positions.
- If continuity is not present, replace the wiper switch.

3. Check Wiper Relay

Locate the wiper relay in the fuse box (refer to the owner’s manual for exact location).
Remove the relay and inspect for burn marks or damage.
Swap the relay with a similar one from the fuse box to test functionality.
If the wipers turn off, replace the faulty relay.

4. Test Wiper Motor

Reconnect the battery and turn the ignition to the "on" position.
Using the multimeter, measure the voltage at the wiper motor connector while toggling the wiper switch.
If voltage is present but the motor does not respond, replace the wiper motor.

5. Wiring Inspection

Inspect the wiring harness connected to the wiper motor and switch.
Look for frayed wires, corrosion, or loose connections.
Repair or replace any damaged wiring as necessary.