| 摘要 |
Disclosed is a pushbutton (5), especially for actuating an electropneumatic parking brake (EPH) in road vehicles, which is connected to evaluation electronics (ECU) (6) via connecting cables (1 to 4). In order to detect switching processes and/or faults, the input resistance of the pushbutton (5) between the connecting points (7, 8) or (9, 10) is evaluated, thus allowing the evaluation electronics (ECU) (6) to reliably detect both the switched position of the pushbutton (5) and potential fault conditions.
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