Installation instructions – seat occupancy sensor emulator – BMW F Series (3 wired)

Seat mat emulator BMW F Series
- installation

Short installation video:

1. Turn the ignition off.

2. Under the front passenger seat, find 4 pin mat connector with 3 wires: white, red, brown.

3. Disconnect mat connector.
If you bought the emulator that is ended with terminals, remove seat mat wires from the plug (using e.g. a small screwdriver) and put the emulator wires in the plug instead (in the same color order!). Be careful not to make a short circuit. The emulator should be connected by a mechanic.
If you bought the emulator that is ended with a connector, just disconnect mat connector and connect the emulator plug instead.

4. Connect the seat belt buckle emulator – installation instructions:

installation instructions – seat belt buckle emulator in BMW F

5. It is usually needed to reset the fault code using proper diagnostic software.

Please remember that after fitting the seat mat emulator a car computer “sees” a passenger seat as occupied by an adult – the airbag will always work in case of any accident. Therefore, you MUST NOT transport children in baby car seats in the front seat.

In most BMW models, the seat occupancy sensor is placed only in passenger side seat. Therefore, you should look for the plug under the passenger seat, not the driver. The exception is BMW 7 Series, in which seat mat is placed in the driver’s, passenger’s and in the rear seat.

If you can’t find the plug, watch our video above. Contact us if you need any help.

If there is 2-wired seat occupancy sensor in the car don’t try to connect the emulator – it fits only 3 wired seat mat.

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. Quite often cause of the airbag warning is 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.

There are a lot of different situations and problems in cars – if you have questions and need additional information, please contact us.

Connect the seat belt emulator – wires red and black.

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).

Installation instructions for the seat belt emulator

If you are using a universal tester/scanner, it may happen that even after erasing the errors from the airbag control unit, the airbag warning light will still be on.
In this situation, performing a full scan of all systems in the car helps. Usually already during the scan the light disappears.

This problem rather doesn’t occur with professional diagnostic computers dedicated only for BMW (they are not cheap mobile applications or programs downloaded from the Internet).