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

575 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 ABS light issues and traction control disablement in Toyota Highlander (2014-2019). Step-by-step guide included.

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 inspecting the brake components.

Symptoms

•ABS light illuminated on the dashboard
•Traction control light activated or system disabled
•Increased stopping distance during braking
•Unusual brake pedal feel (soft or hard)
•Erratic behavior of the traction control system
•Possible fluctuations in the vehicle's stability during turns

Diagnostic Steps

1
Scan the vehicle's onboard diagnostics (OBD-II) system for error codes related to ABS and traction control.
2
Inspect the ABS fuse for continuity and check for any blown fuses.
3
Visually inspect the ABS wheel speed sensors for damage or disconnection.
4
Check the brake fluid level and inspect for any leaks in the brake system.
5
Examine the wiring harness connected to the ABS module for fraying or corrosion.
6
Test the ABS module for proper function using a multimeter.

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
•Jack and jack stands
•Screwdrivers

Parts Required

•ABS fuse (if blown)
•Wheel speed sensors (if damaged)
•Brake fluid (DOT 3 or DOT 4)

Related Faults

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Diagnostic Steps

1
Scan the vehicle's onboard diagnostics (OBD-II) system for error codes related to ABS and traction control.
2
Inspect the ABS fuse for continuity and check for any blown fuses.
3
Visually inspect the ABS wheel speed sensors for damage or disconnection.
4
Check the brake fluid level and inspect for any leaks in the brake system.
5
Examine the wiring harness connected to the ABS module for fraying or corrosion.
6
Test the ABS module for proper function using a multimeter.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Wear safety goggles and gloves.

2. Scan for Error Codes

Use an OBD-II scanner to retrieve any ABS-related codes.
Document the codes for further analysis.

3. Inspect and Replace Components

A. Check ABS Fuse

Locate the fuse box and find the ABS fuse.
Remove the fuse and check for continuity using a multimeter.
Replace with a new fuse if blown.

B. Inspect Wheel Speed Sensors

Lift the vehicle using a jack and secure it with jack stands.
Locate each wheel speed sensor (usually near the brake caliper).
Inspect for damage or disconnection. Clean or replace as necessary.

4. Brake Fluid Inspection

Open the hood and locate the brake fluid reservoir.
Check the fluid level; if low, fill with manufacturer-recommended brake fluid (DOT 3 or DOT 4).
Inspect for leaks in brake lines and connections. Repair as needed.

5. Wiring Inspection

Visually examine the wiring harness connected to the ABS module.
Look for frayed wires or corrosion; repair or replace any damaged sections.

6. Test the ABS Module

With the multimeter, check the voltage and ground connections at the ABS module.
If the module is faulty, replace it following manufacturer specifications.