Mercedes C Class W204 W205 Seat Belt Buckle Replacement & Airbag light Reset B005013 Fault Code

Introduction

This tutorial guides you through the process of replacing the seat belt buckle in a Mercedes C Class (W204/W205) and resetting the airbag light related to the B005013 fault code. This is essential for maintaining vehicle safety and ensuring that warning lights on your dashboard do not indicate unresolved issues.

Step 1: Diagnose the Fault

• Start by connecting your diagnostic tool to the vehicle's OBD-II port.
• Navigate to the diagnostics menu and select your vehicle. You can either:
  • Manually select from a list of vehicles.
  • Use the VIN identification feature if supported.
• Once connected, access the airbag system (SRS - Supplemental Restraint System).
• Read the fault codes. For example, you may encounter:
  • B 5013: Indicates a malfunction in the driver's seat belt buckle due to an open circuit.
• Attempt to clear the fault codes. If the airbag light returns, proceed with the replacement.

Step 2: Remove the Seat

• Locate the four 10mm bolts securing the seat:
  • Two at the front
  • Two at the back
• Carefully unscrew and remove these bolts.
• Tilt the seat backward to easily access the belt buckle.

Step 3: Access the Seat Belt Buckle

• Identify the bolt securing the seat belt buckle; it is usually a 17mm bolt.
• Use a socket set to loosen and remove this bolt.
• Detach the electrical connection from the seat belt buckle:
  • Pull out the yellow connector from the black plastic housing.
  • Release the retaining clips on the electrical connection using a small screwdriver.

Step 4: Install the New Seat Belt Buckle

• Take the new seat belt buckle and attach it to the vehicle:
  • Feed the electrical wire through the designated path.
  • Secure the buckle with the 17mm bolt.
• Connect the electrical wiring:
  • Ensure the connections are secure and click into place.

Step 5: Reassemble the Seat

• Position the seat back into place and loosely bolt it down.
• Before fully securing the seat, plug the seat belt into the buckle to check for any warning lights.

Step 6: Reset the Airbag Light

• Reconnect your diagnostic tool and navigate back to the airbag system diagnostics.
• Read the fault codes and confirm if the previous issues are resolved.
• Click on the option to clear the memory of the fault codes.
• Observe if the airbag light remains off after the clearing operation.

Conclusion

You have successfully replaced the seat belt buckle and reset the airbag light in your Mercedes C Class. Make sure to securely fasten all seat bolts and tidy up any loose wiring with cable ties. If further issues arise or if other fault codes appear, consider consulting a professional or further diagnostics.