Method for determining an installation position (11, 12, 13, 14) of at least one sensor unit (3, 4, 5, 6), which is designed to cover a surrounding area of a motor vehicle, of a communication system of the motor vehicle, in which the sensor unit (3, 4, 5, 6) is connected to a connecting point (15, 16, 17, 18) of the communication system of the motor vehicle, wherein the communication system is designed with the first connecting point for the sensor unit (3, 4, 5, 6), which first connecting point characterizes a first installation position, and with at least one further connecting point (16, 17, 18) for the sensor unit (3, 4, 5, 6), which further connecting point characterizes a further installation position (12, 13, 14), the sensor unit (3, 4, 5, 6) being able to be connected to the first connecting point or to the further connecting point (16, 17, 18) in a compatible manner, characterized in that the first connecting point is directly connected to a main bus of the communication system, and a second connecting point without a direct connection to a main bus of the communication system is predefined as a further connecting point (16, 17, 18), the sensor unit (3, 4, 5, 6) being connected to a control unit of the communication system at the second connecting point by way of a subsidiary bus, wherein, depending on the connecting point (15, 16, 17, 18) at which the sensor unit is connected, the sensor unit (3, 4, 5, 6) is automatically provided with information characterizing this specific installation position (11, 12, 13, 14) by the communication system, a main bus signal being transmitted to the sensor unit connected to the first connecting point as characterizing information for the first installation position, and a first signal from the control unit of the communication system being transmitted to the connected sensor unit as characterizing information for a second installation position, the first signal being transmitted via the subsidiary bus (24a, 24b) of the communication system, which is different from the main bus, and wherein an association for the information characterizing the specific installation position (11, 12, 13, 14) is made by the sensor unit (3, 4, 5, 6) in order to identify the specific installation position (11, 12, 13, 14). wherein the communication system is designed with the first connecting point for the sensor unit (3, 4, 5, 6), which first connecting point characterizes a first installation position, and with at least one further connecting point (16, 17, 18) for the sensor unit (3, 4, 5, 6), which further connecting point characterizes a further installation position (12, 13, 14), the sensor unit (3, 4, 5, 6) being able to be connected to the first connecting point or to the further connecting point (16, 17, 18) in a compatible manner, characterized in that the first connecting point is directly connected to a main bus of the communication system, and a second connecting point without a direct connection to a main bus of the communication system is predefined as a further connecting point (16, 17, 18), the sensor unit (3, 4, 5, 6) being connected to a control unit of the communication system at the second connecting point by way of a subsidiary bus, wherein, depending on the connecting point (15, 16, 17, 18) at which the sensor unit is connected, the sensor unit (3, 4, 5, 6) is automatically provided with information characterizing this specific installation position (11, 12, 13, 14) by the communication system, a main bus signal being transmitted to the sensor unit connected to the first connecting point as characterizing information for the first installation position, and a first signal from the control unit of the communication system being transmitted to the connected sensor unit as characterizing information for a second installation position, the first signal being transmitted via the subsidiary bus (24a, 24b) of the communication system, which is different from the main bus, and wherein an association for the information characterizing the specific installation position (11, 12, 13, 14) is made by the sensor unit (3, 4, 5, 6) in order to identify the specific installation position (11, 12, 13, 14).