A sensing system of a vehicle includes a control and a mounting carrier that supports a plurality of sensor units. The mounting carrier is configured to be disposed at the vehicle so that the plurality of sensor units have respective fields of sensing exterior of the vehicle. The mounting carrier includes structure to support the sensor units at an exterior structure of the vehicle so as to provide a desired field of sensing. The mounting carrier includes an electrical connector that is configured to electrically connect to an electrical connector of the vehicle. The sensor units are electrically connected to a circuit element that is electrically connected to the electrical connector of the mounting carrier. The control, responsive to outputs of the circuit element, determines the presence of one or more objects exterior the vehicle and within the field of sensing of at least one of the sensor units.