how to fix BMW 3 Series G20/G21 (2019-2024) seatbelt warning not working

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Disconnect the negative terminal of the battery to prevent any electrical issues.

2. Inspect and Replace Seatbelt Buckle

• Sub-steps:
  1. Remove the lower trim panel covering the seatbelt assembly using a trim removal tool.
  2. Disconnect the seatbelt buckle connector from the wiring harness.
  3. Inspect the seatbelt buckle for signs of wear or malfunction. If damaged, proceed to replace it.
  4. Install the new seatbelt buckle by connecting it to the wiring harness and securing it in place.

Tools Required:

• Trim removal tool
• Socket set
• Screwdriver set

3. Check and Replace Fuses

• Sub-steps:
  1. Locate the fuse box, typically found under the dashboard or in the engine compartment.
  2. Refer to the vehicle's owner manual to identify the fuse associated with the seatbelt warning system.
  3. Remove the fuse using a fuse puller and inspect it for any signs of damage or burnout.
  4. Replace with a new fuse of the same amperage if necessary.

Tools Required:

• Fuse puller (optional)

4. Reconnect Battery and Test System

• Sub-steps:
  1. Reconnect the negative terminal of the battery.
  2. Start the vehicle and check if the seatbelt warning light illuminates when the seatbelt is unfastened.
  3. Test the warning chime by unfastening the seatbelt while the vehicle is in motion.