The seat occupancy mat is a sensor mounted in the front passenger seat. The emulator simulates a situation of a person sitting in the passenger seat with a seat belt fastened. To make the emulator work, you need a diagnostic tool (such as Autel, , iCarsoft, etc.) to remove old error codes from the airbag control unit related to a faulty seat mat. Once the emulator is connected, your diagnostic tool can clear stored errors and turn off the SRS/airbag warning light. Please note that error codes related to safety systems do not clear automatically. Before purchase, scan your vehicle with a diagnostic tool to confirm that the SRS/airbag warning is caused by a defective seat occupancy sensor. Name: Car Seat Occupancy Mat Sensor SRS Bypass Emulator Fitment Type: Direct Replacement Installation Condition: Type: 3+2 Pin, 2 Heads Fitment: for C-Class W203 Saloon/Sedan (2000–2004) before facelift Color: As Shown Material: Plastic Package Contents: 1 x Car Seat Bypass Emulator Sensor Note: Light reflection and different display settings may cause slight variations in color between the product image and the actual item. Measurement may vary by up to +/- 1–3 cm.