| 摘要 |
The invention relates to a method for detecting a fault of an operating switch (SW1, SW2, SW3) connected to an analysis unit (ST1) by means of at least one signal line (L1, LN1), having at least one first switching plane (E1, E11) for initiating a vehicle function of a vehicle, wherein a signal specifying the switch setting for initiating the vehicle function is detected and evaluated by the analysis unit (ST1); according to the invention, the first switching plane (E1, E11) is connected at one end to a first potential of the vehicle electrical system voltage (UBatt) of the vehicle and can be connected at the other end to the signal line (L1, LN1) for forming a first contact branch (K1) in a first switch setting, the first switching pane (E1, E11) is bridged by a diode device (DR1, DR1.1) in the blocked direction with respect to a first potential of the vehicle electrical system voltage (UBatt), a test voltage (UPrüf) is generated by means of the analysis unit (ST1), the voltage thereof being greater in magnitude than the first potential, the test voltage (UPrüf) is applied to the signal line (L1) of the first contact branch (K1), and the potential arising at the signal line (L1) of the first contact branch (K1) is evaluated by the analysis unit (ST1) for detecting a fault. |
