![]() The other function of the electronic box within the seat is to auto-detect the presence of the MB child seat, this is done by using RFID (radio frequency identification) working in the same way as the detection alarms at the doors of music shops etc. Once the seat is sat on, the electronic box in the seat changes the frequency of the pulse which is again detected by the ABCM to turn the passenger bags on. ![]() This beat is detected by the ABCM (Air bag control module) when the seat is unoccupied and turns off the air bags on passenger side. There is an electronic box inside the seat base that forms part of the sensor matrix, the ends of the wire ‘maze’ are connected to this and it converts the status of the occupancy detector into a CAN output signal that is piped to the Air Bag Control Module (as a PWM signal) An over simplistic way to imagine this, is to think of it as a pulse, like a heart beat at a fixed rate. Post face lift set up is far more complex. On cars pre face lift, without auto child seat detection, the connection from the seat occupancy sensor is connected directly to the Air Bag Control Module and operates just as a simple switch, changing the potential of the signal line to the module when sat on.
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