The seat occupancy mat is a sensor mounted in the front passenger seat. The emulator simulates a situation where a person is sitting in the passenger seat with a seat belt fastened. To make the emulator work, you need a diagnostic tool to clear existing errors from the control unit related to a faulty seat mat. Once the emulator is connected, use your diagnostic tool to clear stored errors and turn off the SRS warning light. Errors related to safety systems must be manually cleared and will not reset automatically. Before purchase, scan your vehicle with a diagnostic tool to confirm the SRS warning is caused by a defective seat mat.Name: Car Seat Occupancy Mat Sensor SRS Bypass Emulator Fitment Type: Direct Replacement Fitment: For CLK W209 20062009, MB CLK W209 20062009, C W203 20052007 Note: Installation guide not included. Professional installation is strongly recommended. Please verify compatibility to ensure this item meets your needs. Compatibility information is for reference only. Always compare the part number with your original before purchasing. Color: As shown Material: Plastic Package Contents: 1 x Car Seat Bypass Emulator Sensor Package includes only the items listed above; other products are not included. Note: Lighting and display settings may cause slight color variations between the image and the actual item. Measurement allows an error of +/- 13 cm.