what does code B0111 mean for my Toyota Highlander Fourth Generation (2020-present)?

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 and wait at least 10 minutes to discharge the airbag system.

2. Inspect Airbag Harness and Connections

• Remove the passenger seat by unfastening the mounting bolts using a socket set.
• Carefully lift the seat to access the airbag harness.
• Visually inspect the harness for any signs of wear, fraying, or corrosion.
• Repair or replace any damaged sections of the harness as necessary.

3. Test Airbag Module and Wiring

• Reconnect the battery and turn the ignition to the "on" position without starting the engine.
• Use a multimeter to test the resistance across the airbag module connector; it should typically read between 2-4 ohms.
• If the resistance is outside this range, replace the airbag module.

4. Verify Seat Occupancy Sensor

• Check the seat occupancy sensor for proper alignment and connectivity.
• If the sensor is faulty, replace it following the manufacturer's instructions.
• Reconnect the airbag harness and ensure all connections are secure.

5. Reassemble and Clear Codes

• Reinstall the passenger seat and tighten the mounting bolts to the manufacturer's torque specifications (typically around 45 ft-lbs).
• Reconnect the negative battery terminal and use the OBD-II scanner to clear the B0111 code.
• Perform a system check to ensure the airbag warning light is off.