my BMW 3 Series G20/G21 (2019-2024) seatbelt warning is not working, what could be wrong?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety during repairs.

2. Inspect Seatbelt Components

• Remove the seatbelt buckle assembly from the seat.
  • Tools: Socket set
  • Sub-steps:
    • Locate the screws securing the buckle and remove them.
    • Disconnect the electrical connector from the buckle.

3. Test Seatbelt Sensor

• Use a multimeter to check the continuity of the seatbelt sensor.
  • Tools: Multimeter
  • Sub-steps:
    • Connect the multimeter probes to the terminals of the seatbelt sensor.
    • Check for continuity when the seatbelt is unbuckled and buckled.

4. Inspect and Replace Fuse

• Locate the fuse box and identify the fuse related to the seatbelt warning system.
  • Tools: Fuse puller or pliers
  • Sub-steps:
    • Remove the fuse and inspect it for any signs of damage.
    • Replace with a new fuse of the same amperage if blown.

5. Reconnect Components

• Reattach the seatbelt buckle assembly and reconnect the battery.
  • Sub-steps:
    • Secure the buckle assembly back to the seat with screws.
    • Reconnect the electrical connector to the buckle.