how to fix the traction control light on Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the vehicle is parked on a level surface and securely lifted if necessary.

2. Diagnose Error Codes

• Using the OBD-II scanner, retrieve and note any error codes related to the traction control system.
• Clear the codes and take the vehicle for a test drive to see if the light reappears.

3. Inspect and Clean Wheel Speed Sensors

• Locate each wheel speed sensor (usually mounted on the wheel hub).
• Disconnect the electrical connector and remove the sensor using a socket set.
• Clean the sensor with an appropriate electrical cleaner and inspect for any physical damage.
• Reinstall the sensor and reconnect the connector.

4. Check Brake Fluid Level

• Open the hood and locate the brake fluid reservoir.
• Check the fluid level; if low, top off with the manufacturer-recommended brake fluid.
• Inspect for leaks in the brake lines and around the master cylinder.

5. Inspect ABS Module

• Locate the ABS module; typically found near the brake master cylinder.
• Check for any visible damage or leaks.
• Ensure all electrical connections are secure and free from corrosion.

6. Test Traction Control Switch

• Identify the traction control switch on the dashboard.
• Test the switch for continuity using a multimeter.
• If faulty, replace the switch with a new component.

7. Reassemble and Reconnect Battery

• Once all components have been inspected and repaired as necessary, reconnect the battery.
• Ensure all tools and debris are removed from the engine bay.