why does my BMW 3 Series F30/F31 (2012-2019) airbag light stay on after starting

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torx screwdriver, safety goggles, gloves.
• Disconnect the negative battery terminal to prevent accidental deployment of airbags during repairs.

2. Scan for Error Codes

• Use the OBD-II scanner to identify any fault codes related to the airbag system.
• Document the codes for reference.

3. Inspect and Repair Connections

• Remove the driver's seat if necessary to access the seat wiring harness.
• Check for any loose or damaged connectors, especially those linked to the airbag system.
• Repair or replace any damaged wiring or connectors as needed.

4. Replace Faulty Components

• If fault codes indicate a specific component failure (e.g., airbag module, seat occupancy sensor), replace the affected part.
• Follow manufacturer guidelines for part installation, ensuring correct orientation and securing all connections.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal after all repairs have been made.
• Use the OBD-II scanner to clear any existing fault codes and reset the airbag light.

6. Final Check

• Conduct a check using the OBD-II scanner to ensure no new codes appear.
• Test the airbag system functionality, ensuring all components, including sensors and modules, are operational.