my Toyota Highlander XU70 (2020-Present) has a check engine light and code B1234, what does it mean?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shock and short circuits.

2. Inspect and Replace Faulty Component

• Identify the component related to code B1234, which may involve the airbag system or a specific electrical module.
• If the component is accessible:
  1. Remove any necessary trim panels to access the component.
  2. Disconnect the wiring harness and any mounting bolts.
  3. Remove the faulty component.
  4. Compare the old component with the new one to ensure compatibility.

3. Install New Component

• Install the new component:
  1. Position the new component in place.
  2. Reattach any wiring harnesses and secure with bolts.
  3. Ensure all connections are tight and free of corrosion.

4. Reassemble and Reconnect

• Reattach trim panels or any other components removed during the repair.
• Reconnect the negative battery terminal.

5. Clear Codes and Test

• Use the OBD-II scanner to clear the B1234 code from the vehicle's computer.
• Start the engine and check for the check engine light illumination.