how to troubleshoot ABS light on Toyota Highlander Fourth Generation (2020-present)

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

574 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to troubleshoot and fix the ABS light issue on a 2020-present Toyota Highlander. Step-by-step guide with diagnostic and repair instructions.

Affected Component

Brakes

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to avoid shock or short circuits.
•Ensure the vehicle is securely lifted and supported on jack stands before working underneath it.

Symptoms

•ABS warning light illuminated on the dashboard
•Pulsing brake pedal during braking
•Reduced braking efficiency or longer stopping distances
•Unresponsive or sluggish ABS activation
•Potential traction control system warning light illuminated

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific ABS-related trouble codes.
2
Inspect the ABS fuse for continuity and replace if blown.
3
Check the wheel speed sensors for damage or disconnection.
4
Inspect the ABS module wiring for any fraying or corrosion.
5
Verify brake fluid levels and check for leaks in the brake system.
6
Test the ABS pump operation by performing a brake system diagnostic with a scan tool.

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
•Brake cleaner
•Flathead screwdriver

Parts Required

•Wheel speed sensor (if faulty)
•Brake fluid

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific ABS-related trouble codes.
2
Inspect the ABS fuse for continuity and replace if blown.
3
Check the wheel speed sensors for damage or disconnection.
4
Inspect the ABS module wiring for any fraying or corrosion.
5
Verify brake fluid levels and check for leaks in the brake system.
6
Test the ABS pump operation by performing a brake system diagnostic with a scan tool.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, brake cleaner, and a flathead screwdriver.
Park the vehicle on a flat surface and engage the parking brake. Disconnect the battery to ensure safety while working on the electrical components.

2. Inspect and Replace Wheel Speed Sensors

Sub-steps:
1. Raise the vehicle using jack stands and remove the wheel to access the brake assembly.
2. Locate the wheel speed sensor, which is typically mounted near the brake rotor.
3. Disconnect the electrical connector from the sensor and remove the sensor using the appropriate socket.
4. Inspect the sensor for dirt or damage; clean or replace it if necessary.
5. Reinstall the new or cleaned sensor, ensuring it is securely fastened and the connector is reattached.

3. Check ABS Module Wiring

Sub-steps:
1. With the vehicle still raised, visually inspect the wiring harness connected to the ABS module for any signs of wear, fraying, or corrosion.
2. Use a multimeter to test for continuity in the wiring. Repair or replace any damaged wires as needed.
3. Ensure all connectors are securely fastened and free of corrosion.

4. Brake Fluid Level and System Check

Sub-steps:
1. Check the brake fluid reservoir level; add fluid if it is low, using the manufacturer-recommended type.
2. Inspect brake lines and connections for leaks. Repair any leaks found.
3. Bleed the brake system if fluid level was low to ensure no air is trapped in the lines.

5. Reset the ABS Light

Sub-steps:
1. Reconnect the battery.
2. Use the OBD-II scanner to clear any stored ABS trouble codes.
3. Start the vehicle and check if the ABS light is still illuminated.