Seat mat emulator Mercedes - installation
1. Turn the ignition off.
2. Under the passenger side seat find the seat occupancy sensor connector.
Seat occupancy sensor wires colors in different versions:
- white, red, brown (the most common three-wired mat)
- black, black (two-wired mat)
- blue, brown, black (in some newer models)
- white, red, brown, green (in some american US version models)
How to disconnect it, it's not removable...
Before you go crazy about one of the most common problems – if you have one of the many Mercedes models that has a large yellow connector (including W204, W205, W212, W213, W176, W246, W166 and more) and you can’t disconnect the plugs from this connector in order to connect the emulator, in the video below we present our method:
Click on selected model to scroll to the photos of the seat mat plug:
A-Class:
W168 1997-2004
W169 2004+(two-wired mat)
W169 2004+ (three-wired mat)
W176 (three-wired mat)
B-Class:
W245 2004+ (two-wired mat)
W245 2004+ (three-wired mat)
W246 (three-wired mat)
C-Class:
W202 1997-2001
W203 2000-2004/6
W203 2004/6-2007
W204 2007-2014 (three-wired mat)
CLK-Class:
W208 1997-2003
W209 2002-2003/4
W209 2006-2009
ML-Class:
W163 1998-2005
W164 2005-2011
W166 (three-wired mat)
S-Class:
W220 1998-2005
W221 2005-2013
E-Class:
W210 1995-2003
W211 2002-2003
W211 2003/4-2009
W212 S212 C207 A207 2009-2016
W213
R-Class:
R251 2005-2013
SLK-Class:
R171 2004-2011
Vito / Viano:
W638 1995-2003
W639 2003-2014
Click on the picture to enlarge
Above, we present pictures of a classic three-wire mat in A-Class.
Sometimes in W168 it may happen that there are five wires in the plug. Such a case is presented in the pictures below:
The emulator should be connected to three wires (white, red, brown). Two black wires leave unchanged.
It is best to connect the emulator outside of the presented connector. For this purpose, cut the mat wires (white, red, brown) and connect the emulator towards the car installation by soldering wires or using little clamp connectors.
Thanks to the fact that the plug visible in the picture stays connected, the two black wires remain connected without any changes.
Click on the picture to enlarge
The emulator supplied by us has wires in the following colors: white, red, brown.
3 wired seat mat in W176 usually has wires: blue, brown, black.
This information is not important if the emulator is equipped with a plug – just unplug the mat and connect the emulator plug.
- If the seat mat on your car has 2 wires, don’t try to connect 3-wired emulator. As it is written in the item description in the listing, it doesn’t work with 2-wired version.
To connect the emulator which is ended with terminals (not plug), replace the wires in the plug accordingly to the diagram below:
Brown – brown – „GND”
Black – red – „+12V”
Blue – white – signal
Watch our short installation video - it looks very similar as in W212:
The emulator supplied by us has wires in the following colors: white, red, brown.
The seat mat in W246 usually has wires in the following colors: blue, brown, black.
This information is not important if the emulator is equipped with a plug – just unplug the mat and connect the emulator plug.
To connect the emulator which is ended with terminals (not plug), replace the wires in the plug accordingly to the diagram below:
Brown – brown – „GND”
Black – red – „+12V”
Blue – white – signal
Watch our short installation video:
Below we present the connection of the latest version of the emulator – 2in1. The seat mat and seat belt emulator are put in one enclosure which is easier to hide under the seat. The seat mat emulator plug was connected in place of the mat, the seat belt emulator plug – in place of the seat belt buckle.
Watch our short installation video:
In W204 and W212, the three-wire mat has two color versions of wires, as shown in the pictures below:
The first plug on the right is the seat belt buckle plug.
Watch our short installation video:
Click on the picture to enlarge
seat mat plug on the right
Watch our short installation video:
The first plug on the right is the seat belt buckle plug.
The first plug on the right is the seat belt buckle plug.
Watch our short installation video:
In ML W166, the three-wired mat may have two color versions of wires, as shown in the pictures below:
The first plug on the right is the seat belt buckle plug.
Watch our short installation video - W166 looks similar to W212:
If you bought emulator ended with a plug, before connecting it, check if there is exactly the same color order of wires in the seat mat plug and in the emulator plug. Sometimes the wires order in the plug in the car was different, in this case the wiring sequence should also be changed in the emulator plug before connecting.
FAQ - PROBLEMS AND SOLUTIONS
In all Mercedes models, originally the seat occupancy sensor is placed only on passenger side seat. Therefore, you should look for the plug under the passenger seat, not the driver.
In different models there are different mat plugs. If you can’t find photos from your model above, see other photos – maybe among them there is the version that was placed in your car.
The seat occupancy sensor may have: 2 black wires or 3 wires (white, red, brown) or 3 wires (blue, brown, black) or 4 wires (white, red, brown, green).
If you still can’t find the correct plug, contact us and attach to your message as exact photos as you can, showing all connections under the passenger seat. Don’t forget to add information about the car (model, manufacturing year, european or US version).
Connect the seat belt buckle emulator.
Installation instructions for the seat belt emulator – click
After connecting the seat occupancy sensor emulator, the airbag control unit (and car computer) “sees” the front passeneger seat as always occupied (even if there’s no passenger).
Therefore, cars equipped with seat belt fastening sensor will report a request to fasten the seat belt (the unfastened seat belt warning light/sound appears). Connecting the seat belt emulator will solve the problem (car computer will “see” the passenger seat belt as always fastened).
Reset the fault code using proper diagnostic software.
If resetting the fault does not help make sure that the warning light is caused by faulty seat occupancy sensor – the airbag warning light indicates a failure in the safety system and it does not necessarily have to be seat mat. The seat occupancy sensor emulator bypasses faulty seat occupancy sensor only – not other parts of the srs system. Often the cause of the airbag warning may be a faulty seat belt tensioner. That can also be other parts (airbags, BST, airbag control unit etc.) or a defect in the car installation – perform accurate computer diagnostics using a good software – cheap / non-original scanners often show different errors than they actually do.
Sometimes there may be different types of mat in Mercedes and it may be necessary to change the emulator settings. If you can not reset the fault code related to the damaged seat mat, please contact us. We will need the following information:
1. Model and year of production of the car and the car version – European or American.
2. Exact codes and descriptions of errors from diagnostics before connecting the emulator.
3. Exact codes and descriptions of errors from diagnostics after connecting the emulator.
4. Transaction details so that we could find the transaction and see exactly which device was sent (name and surname or nickname from ebay or order number, date of purchase).
The flashing SRS can have many causes.
The most common reason is the airbag control unit was unlocked for programming – it needs to be blocked. Another cause may be too low power supply voltage to the airbag control unit or its incorrect coding. Other causes include, for example, a problem with the ignition module or badly erased crash data.