how to fix B1122 code in Volvo XC60 536 (2017-Present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, screwdriver set, wiring harness connector cleaner.
• Disconnect the negative battery terminal and allow the system to discharge for at least 10 minutes to ensure safety.

2. Inspect Wiring and Connectors

• Remove the passenger seat to access the wiring harness beneath.
  • Sub-steps:
    1. Unbolt the seat using a socket set (typically 10mm bolts).
    2. Carefully disconnect any electrical connectors from the seat.
    3. Inspect all wiring for frayed or damaged insulation.
    4. Clean connectors with a wiring harness connector cleaner.

3. Check the Occupancy Sensor

• Test the passenger seat occupancy sensor using a multimeter.
  • Sub-steps:
    1. Locate the occupancy sensor on the seat cushion.
    2. Attach the multimeter leads to the sensor terminals.
    3. Measure the resistance; it should be within the manufacturer’s specified range (check service manual for details).
    4. If out of range, replace the occupancy sensor.

4. Reinstall the Seat

• Reinstall the passenger seat after repairs.
  • Sub-steps:
    1. Reconnect all electrical connectors securely.
    2. Position the seat correctly and bolt it back using the socket set.
    3. Ensure no wires are pinched or damaged during the installation.

5. Reconnect Battery and Test

• Reconnect the negative battery terminal.
  • Sub-steps:
    1. Clear any codes from the OBD-II scanner.
    2. Start the vehicle and check if the airbag warning light remains off.
    3. Verify that the passenger airbag indicator functions correctly when the seat is occupied.