driving of the motor vehicle an appropriate acceleration sensor or the like issues a signal to can bus 86 which is transferred via can transceiver 84 and first micro controller can lead 82 to the micro controller 78 the micro controller 78 exports the crash signal to the first digital analog converter 88 which in turn passes an analog crash signal through the first high pass filter 90 which is passed through the circuit as described above and is reconverted into its original digital format in second analog digital converter 94 the second analog digital converter 94 exports the digital crash signal to second micro controller 96 which in response thereto issues a signal to the airbag system 58 to trigger ignition of the pellet and inflation of the airbag conversely in the event that one of the signal switches 54 or 56 is activated by the user a digital signal related thereto is communicated to the second micro controller 96 which in turn passes the switch signal through the digital analog converter 94 to produce an analog signal corresponding to the switch signal which passes through second high pass filter 92 first high pass filter 90 first analog digital converter 88 and into first micro controller 78 the first micro controller 78 can process the signal and distribute it either to the can transceiver 84 or to the steering column bus 80 for appropriate action in the embodiment of fig3 the first and second micro controllers 78 96 provide digital headers to the various incoming digital signals which are then recognized.