A method is provided for indicating a presence of a high voltage at a high-voltage component equipped in a vehicle. The method includes the steps of connecting an external reader to a communication bus of the vehicle, outputting a signal by way of the high-voltage component or by way of a component control unit which is connected to the high-voltage component, to the communication bus, wherein the signal indicates whether a high voltage is present at the high-voltage component, and reading the signal from the communications bus by way of the external reader.