how to fix the B1234 error code on my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, and screwdrivers.
• Ensure the vehicle is parked on a level surface, and the ignition is off.
• Disconnect the negative battery terminal to prevent accidental airbag deployment.

2. Inspect and Repair the Seatbelt Buckle

1. Remove the Seat Cushion

   • Use a socket set to remove the bolts securing the driver's seat.
   • Disconnect any electrical connectors under the seat for power or airbags.
   • Carefully lift the seat out of the vehicle and place it on a soft surface.

2. Access the Buckle Connector

   • Locate the seatbelt buckle assembly and disconnect the wiring harness.
   • Inspect the connectors for corrosion or damage; clean or replace as necessary.

3. Test the Seatbelt Assembly

   • Use a multimeter to measure the resistance of the seatbelt buckle. The resistance should be within manufacturer specifications (typically around 2-4 ohms).
   • If the resistance is out of range, replace the seatbelt buckle assembly.

3. Reassemble the Components

1. Reconnect Everything

   • Reattach the wiring harness to the seatbelt buckle.
   • Secure the seat back into the vehicle, reconnecting any electrical connectors previously disconnected.

2. Reconnect the Battery

   • Reattach the negative battery terminal and ensure it is tight.

4. Clear Codes and Test

1. Use the OBD-II Scanner
   • Start the vehicle and use the OBD-II scanner to clear the B1234 error code.
   • Monitor the airbag light to ensure it remains off after clearing.