why is my Toyota Highlander Third Generation (2014-2019) ABS light on and traction control disabled

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

569 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 diagnose and fix the ABS light and traction control issues in a 2014-2019 Toyota Highlander. Step-by-step guide with diagnostic procedures 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.
•Allow the vehicle to cool before inspection.

Symptoms

•ABS warning light illuminated on the dashboard
•Traction control warning light illuminated
•Reduced braking performance or feel
•Unresponsive traction control system
•Possible warning messages displayed on the vehicle’s information screen

Diagnostic Steps

1
Scan the vehicle’s onboard diagnostic system using an OBD-II scanner for any trouble codes related to the ABS or traction control system.
2
Inspect the ABS fuse for continuity and proper function.
3
Check the brake fluid level in the master cylinder reservoir.
4
Visually inspect the wheel speed sensors for damage or disconnection.
5
Examine the ABS module and wiring for corrosion, loose connections, or damage.
6
Test the ABS pump and relay for proper operation.

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

Parts Required

•Wheel speed sensors (if damaged)
•ABS fuse (if blown)
•ABS module (if faulty)

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Diagnostic Steps

1
Scan the vehicle’s onboard diagnostic system using an OBD-II scanner for any trouble codes related to the ABS or traction control system.
2
Inspect the ABS fuse for continuity and proper function.
3
Check the brake fluid level in the master cylinder reservoir.
4
Visually inspect the wheel speed sensors for damage or disconnection.
5
Examine the ABS module and wiring for corrosion, loose connections, or damage.
6
Test the ABS pump and relay for proper operation.

Solution

1. Preparation

Gather tools and materials: OBD-II scanner, multimeter, socket set, torque wrench, and brake cleaner.
Ensure the vehicle is parked on a level surface and engage the parking brake.

2. Address Diagnostic Trouble Codes

Sub-step 1: Connect the OBD-II scanner and retrieve any stored trouble codes.
Sub-step 2: Make a note of the codes to identify the specific issues affecting the ABS system.
Sub-step 3: Clear the codes and take the vehicle for a test drive to see if the codes return.

3. Inspect and Replace Wheel Speed Sensors

Sub-step 1: Raise the vehicle safely using jack stands and remove the wheels for access.
Sub-step 2: Locate the wheel speed sensors on each wheel hub assembly.
Sub-step 3: Check for physical damage or dirt on the sensors. Clean if necessary.
Sub-step 4: Test the sensor connectivity using a multimeter. If faulty, replace with new sensors.
Tools Required: Socket set, multimeter.

4. Check ABS Fuse and Wiring

Sub-step 1: Access the fuse box and locate the ABS fuse. Inspect for continuity.
Sub-step 2: Replace the fuse if it is blown.
Sub-step 3: Inspect wiring harness for corrosion or disconnections. Repair or replace as necessary.

5. Test and Replace ABS Module (if necessary)

Sub-step 1: If all previous steps do not resolve the issue, test the ABS module using manufacturer-specific diagnostic tools.
Sub-step 2: If the module is confirmed faulty, disconnect the battery, remove the module, and replace it with a new one.
Sub-step 3: Reconnect all wiring and ensure proper installation.
Safety Warnings: Disconnect the battery before working on electrical systems; allow the vehicle to cool before inspection.