how to diagnose the B1235 code in my Toyota RAV4 XA40 (2013-2018)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, safety glasses, and gloves.
• Safety Warnings: Disconnect the battery before working on the airbag system to avoid accidental deployment.

2. Clear Codes and Test

• Clear the B1235 Code: Use the OBD-II scanner to clear the B1235 code from the vehicle’s memory.
• Test Drive: Conduct a test drive to see if the code reappears after clearing.

3. Replace Faulty Components

• Passenger Airbag Module: If the airbag module is confirmed faulty, replace it:

  1. Disconnect the battery.
  2. Remove the passenger airbag cover.
  3. Unplug the airbag connector and remove the airbag.
  4. Install the new airbag and reconnect the wiring.
  5. Reinstall the cover and reconnect the battery.

• Seat Weight Sensor: If the weight sensor is faulty, replace it:

  1. Remove the passenger seat from the vehicle (unbolt and disconnect connectors).
  2. Replace the seat weight sensor located under the seat.
  3. Reinstall the seat and reconnect the battery.

4. Final Assembly

• Reassemble any panels or covers removed during the process.
• Ensure all components are securely fastened and properly connected.