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Seat Occupancy Mat Sensor Emulator SRS Bypass for Mercedes-Benz C-Class W204 (2007-2014)

Reference: BLW204

US$53.47 Save 7%

Seat Occupancy Mat Sensor Emulator SRS Bypass for Mercedes-Benz C-Class W204 (2007-2014)

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Origin: Made in EU
Original plug(s): Included
Warranty: 24 months 
Other info: Seat belt emulator included

The emulator overrides defective occupancy mat error and fix an airbag warning light. Instead of replacing faulty occupancy mat (which requires de-installation of the seat) you can install the emulator which is a safe and inexpensive solution. This is also a great solution if you installed bucket seats. The device sends a signal about the presence of a passenger on the seat (even in his absence). The airbag warning light should be turned off. In case of an accident, airbag will ALWAYS deploy - with or without a passenger on the seat. The device is for diagnostic use only. Do not not place the child seat on the front seat!


Mercedes-Benz cars with a seat mat plug with 3 wires (colors: red, white, brown or black, brown, blue).
- C-Class W204 Saloon/Sedan (model year: 2007-2014)
- C-Class S204 Estate (model year: 2007-2014)

This emulator will NOT work with cars sold in USA and Canada!!! Cars sold in USA and Canada after 2004/2005 have different seat mat - the WSS occupancy seat mat with 4 wires (colors: red, green, brown, yellow). The WSS mat needs a different emulator. Contact us if you need the emulator for 4-wired seat mat.


The emulator is neither a toy nor a magical device that solves every SRS problem. Mercedes has a few sensors that can cause the airbag warning light. You have to perform diagnosis with a diagnostic device before purchase (we recommend the Star Diagnosis) to make sure your problem is related to a faulty seat mat. The most common error related to a faulty seat mat is "Component B48". If the errors show "short circuits" or "open circuits" we advise you to visit your local car electrician first before purchase. In most cases "short circuits" and "open circuits" indicate problems with car's electric installation (there might be damaged/loose wires or connectors). The emulator will not solve these problems and will not work with damaged electric installation. It will be like plugging an electronic device to a power socket with damaged or disconnected wires.

This emulator only solves problems caused by faulty seat mat. Please remember that the errors appearing on the car’s dashboard are NOT an indication that a seat mat is broken.


The emulator is a plug & play device. Locate the seat mat plug under the passenger seat, unplug it and replace it with the emulator's plug. The LED light on emulator should start to blink alternately blue/green or red/green light (depends on the emulator). It means the emulator has a signal and connected successfully with the Airbag Control Unit (ACU). The airbag warning light should turn off automatically (sometimes it is necessary to delete old error with a diagnostic device to remove the airbag warning light). No blinking lights or one color missing mean there is a problem with proper communication with the ACU.

Let us know if our item is not working properly or is defective. We will help you solve the issue, replace the emulator with a new one or cover the return shipping and give you a full refund. Please remember, sometimes it is also necessary to delete old error with a diagnostic device to remove the airbag warning light.

Read our installation instruction


Data sheet

C W204 Saloon/Sedan (2007-2014)
C204 Coupe (Typ W204, 2011-2015)
C S204 Estate (Typ W204, 2007-2014)
Part type
Seat Mat Emulator
Assembly side
24 months
Country / Region of Manufacture
1 item
0,1 kg

Specific References


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We send items to all countries around the world. Shipping cost and expected delivery time depends on destination. We usually ship items within 1-2 working days. Shipping time depends on the hour the order was made. We test and visually check every item before packing to make sure you receive working and undamaged item.

Estimated delivery time to United Kingdom:
Express DPD, FedEx, UPS, DHL - 3-4 working days
Express Poczta Polska - 5-7 working days
Standard - 6-9 working days

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