1 to n are fully off the meandrous current profile is schematically shown in fig2 by the line s in this case as in the case of the exemplary embodiment shown in fig1 the first external connection l 1 is connected to the first touch sensor module a 1 and the second external connection l 2 is connected to the second touch sensor module a 2 in this case too this kind of arrangement of the external connections l 1 l 2 is produced by virtue of the external connections l 1 l 2 being respectively assigned to a pushbutton switch 1 or n which is at a maximum distance from the associated electric assembly b 1 or b n this means that when there is an even number of series connected pushbutton switches 1 to n the two external connections l 1 and l 2 are respectively associated with different actuating modules a 1 and a 2 accordingly it is thus assumed in fig2 that n is an even number by contrast with an uneven number of pushbutton switches and accordingly an uneven number of controllable electric functions the two external connections l 1 and l 2 are respectively associated with the same actuating module fig3 shows another generalization of the exemplary embodiment from fig2 in which an arbitrary number of parallel connected actuating modules a 1 a 2 a m u2212 1 a m having a respective arbitrary number of pushbutton switches 1 2 n u2212 1 n is provided in this case.