A device for monitoring signal levels of signals that are generated, for the purpose of detecting a magnetic field, by a plurality of Hall sensors includes a first, second, and third input and a diagnostic device. The first input is configured to receive a first signal from a first Hall sensor. A first electrical resistor is connected between the first input and a central point. The second input is configured to receive a second signal from a second Hall sensor. A second electrical resistor is connected between the second input and the central point. The third input is configured to receive a third signal from a third Hall sensor. A third electrical resistor is connected between the third input and the central point. The diagnostic device is connected to the central point and is configured to determine a position of the detected magnetic field using an average value.