why does my BMW 3 Series G20/G21 (2019-2024) airbag light stay on

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety while working on the airbag system.

2. Inspect and Repair Connections

• Remove the driver's and passenger's seat covers to access the airbag connections.
• Check for any loose or corroded connectors; clean and reconnect if necessary.
• If any connectors are damaged, replace them with OEM parts.

3. Replace Faulty Components

• Identify any faulty components from the diagnostic steps, such as seatbelt buckle sensors or the airbag control unit.
• If needed, replace the faulty seatbelt buckle sensor:
  • Disconnect the wiring harness.
  • Remove the mounting screws and replace the sensor.
  • Reconnect the wiring harness securely.

4. Clear Fault Codes

• Reconnect the vehicle's battery.
• Use the OBD-II scanner to clear any stored fault codes in the airbag system.
• Perform a system check to ensure no codes return.

5. Final Inspection

• Conduct a visual inspection of the airbag system for any remaining issues.
• Ensure all components are securely fastened and connected.