The seat occupancy mat is a sensor located in the front passenger seat. The emulator simulates the presence of an occupant with a seat belt fastened. To use the emulator, a diagnostic tool is required to clear stored error codes related to a faulty seat mat from the control unit. After connecting the emulator, use the diagnostic tool to clear existing errors and turn off the SRS warning light. Note that system-related errors do not clear automatically. Before purchasing, scan your vehicle with a diagnostic tool to confirm the SRS warning is caused by a defective seat mat. The warning light can be triggered by one of several seat sensors. This emulator only addresses issues caused by a failed seat occupancy mat. It will not resolve problems caused by other faulty sensors, and the SRS warning may remain active even after installation and error clearing. Name: Car Seat Occupancy Mat Sensor SRS Bypass Emulator Fitment Type: Direct Replacement Fitment: for E-Class W211 Saloon/Sedan (production years: 2004–2009) for E-Class S211 Estate (production years: 2004–2010) for C219 (production years: 2004–2010) for S-Class W221 (production years: 2005–2013) for S-Class Coupe C216 (production years: 2006–2014) Color: As Shown Material: Plastic Package Contents: 1 x Car Seat Bypass Emulator Sensor Only the above package content is included; other items are not included. Note: Lighting and display settings may cause slight color differences between the image and the actual item. Measurement may vary by +/- 1–3 cm.