NHTSA Complaint #11706711 — 2018 BMW X3

The Front Passenger Seat Occupancy Sensor Mat (CIS) in my 2018 BMW X3 failed at 56,000 miles. This failure is confirmed by the specific BMW fault code 930A1C (Seat Occupancy Detector Malfunction) stored in the Advanced Crash Safety Module (ACSM). The component is currently installed in the vehicle and available for inspection. This defect poses a severe safety risk: the system fails to consistently detect a seated front passenger. As a result, the passenger airbag may be disabled and fail to deploy in a collision, significantly increasing the risk of injury or death. The dashboard displays a "Passenger Restraint System" malfunction warning, accompanied by an airbag light and chime. The issue is intermittent and load-dependent. It triggers specifically when an adult passenger occupies the seat for extended periods (e.g., highway driving), indicating a physical fatigue failure of the sensor mat grid under compression. I diagnosed the fault using BMW factory-level diagnostics. However, both the local BMW dealership and BMW North America have refused to cover the diagnosis or repair under the existing warranty extension (SIB 72 01 25) for this exact component, stating my specific VIN is excluded despite the vehicle exhibiting the known safety defect.