how to fix B0081 airbag sensor fault in Volvo XC60 First Generation (2008-2017)

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, torque wrench.
• Ensure the vehicle is parked on a flat surface with the ignition off.
• Disconnect the vehicle battery and wait at least 10 minutes to prevent airbag deployment.

2. Inspect Wiring and Connectors

• Remove the passenger seat by unbolting it from the floor using a socket set.
• Carefully lift the seat to access the wiring underneath.
• Inspect the wiring harness for frays, corrosion, or loose connections.
• Check the connectors for any signs of damage and ensure they are securely fastened.

3. Test the Occupancy Sensor

• Disconnect the occupancy sensor from the harness.
• Using a multimeter, measure the resistance across the sensor terminals.
• Compare the reading with the manufacturer’s specifications (check service manual for the exact values).
• If the resistance is out of range, replace the occupancy sensor.

4. Replace or Repair Components

• If the wiring is damaged, repair or replace the affected sections using solder and heat shrink tubing or replace the entire harness if necessary.
• If the occupancy sensor is faulty, install a new sensor by connecting it to the harness and securely fastening it in place.

5. Reassemble and Reconnect

• Reinstall the passenger seat, ensuring all bolts are tightened to the manufacturer’s torque specifications.
• Reconnect the vehicle battery.
• Clear the fault codes using the OBD-II scanner and perform a system check to ensure the airbag system is functioning correctly.