how to fix the error code B0030 on my BMW 3 Series F30/F31 (2012-2019)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety while working on the electrical system.

2. Inspect and Clean the Connector

• Remove the seat from the vehicle if necessary to access the sensor.
• Disconnect the driver's seat occupancy sensor connector.
• Clean the connector pins and the socket with electrical contact cleaner to remove any corrosion.
• Reconnect the sensor and ensure it clicks into place securely.

3. Check Wiring and Sensor

• Inspect the wiring harness for any signs of damage or fraying.
• Use a multimeter to check for continuity in the wires leading to the occupancy sensor.
• If damaged, repair or replace the wiring as necessary.

4. Replace the Occupancy Sensor (if needed)

• If the sensor is faulty, remove the seat cover (if applicable) to access the sensor.
• Disconnect the old sensor from its mounting location and remove it.
• Install the new occupancy sensor, ensuring it is securely fastened.
• Reconnect the wiring harness to the new sensor.

5. Reassemble and Test

• Reinstall the seat back into the vehicle and secure it.
• Reconnect the negative battery terminal.
• Clear the error codes using the OBD-II scanner and verify that the airbag warning light is off.