how to fix B1101 error code on Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle's battery and allow at least 10 minutes to ensure that all capacitors are discharged.
• Ensure the workspace is clean and organized.

2. Inspect and Repair the Airbag Connector

• Remove the driver’s side lower dash cover using a socket set.
• Locate the airbag harness connector and visually inspect it for damage or corrosion.
• If damage is found, repair or replace the connector as necessary.
  • Tools Required: Socket set, wire connectors, heat shrink tubing.
  • Safety Warning: Never work on the airbag system with the battery connected.

3. Test and Replace the Driver’s Side Airbag

• If the airbag resistance is not within the specified range, replace the driver’s side airbag.
• Disconnect the airbag connector and remove the airbag module using a socket set.
• Install the new airbag module and secure it in place.
• Reconnect the airbag connector ensuring it clicks securely.

4. Reassemble and Reconnect Battery

• Reinstall the driver’s side lower dash cover.
• Reconnect the vehicle's battery and ensure all connections are tight.

5. Perform Final Checks

• Use the OBD-II scanner to check for error codes again.
• Reset the airbag system if necessary and ensure the airbag warning light is off.