what to do if my Toyota Highlander Third Generation (2014-2019) has a B0031 code?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery and wait at least 10 minutes to ensure the airbag system is deactivated.

2. Inspect and Repair Wiring

• Tools Required: Wire stripper, electrical tape, multimeter, soldering iron (if required).
• Carefully remove the driver's seat to access the airbag wiring.
• Inspect the wiring harness and connectors for any frayed wires or corrosion.
• Repair any damaged wires using solder and heat shrink tubing or replace the wiring harness if needed.
• Reconnect any loose connectors securely.

3. Replace Airbag Sensor (if faulty)

• Parts Required: New driver's side airbag sensor.
• Disconnect the airbag sensor connector.
• Remove the faulty airbag sensor from its mounting location.
• Install the new airbag sensor in the same position and secure it with the original fasteners.
• Reconnect the airbag sensor connector.

4. Reassembly

• Reinstall the driver's seat carefully, ensuring all connectors are secured.
• Reconnect the negative terminal of the battery.

5. Clear Codes and Test

• Use the OBD-II scanner to clear the B0031 code from the system.
• Start the vehicle and check if the airbag warning light goes out.