Ultrasonic sensor system for a motor vehicle and method for operating the ultrasonic sensor system

A method for operating an ultrasonic sensor system for a motor vehicle, which comprises an ultrasonic sensor with an electroacoustic transducer arrangement for generating and detecting ultrasonic waves and an electrical test device and also comprises a test control device, wherein the method comprises:

• outputting an electrical test signal to the electroacoustic transducer arrangement by means of the electrical test device;
• capturing an electrical response signal from the electroacoustic transducer arrangement by the electrical test device;
• and
• capturing a characteristic variable of the electrical response signal at a plurality of measurement points by the test control device, while varying a frequency and an amplitude of the electrical test signal,
• wherein the electrical test signal is a constant-current signal, and the characteristic variable comprises an amplitude or a phase angle of a voltage of the response signal at the frequency and the amplitude of the electrical test signal at a respective measurement point of the plurality of measurement points.