A vehicular vision system includes a forward-viewing camera and an electronic control unit (ECU). The forward-viewing camera views forward of the vehicle through the windshield of the vehicle. The forward-viewing camera is operable to capture image data. The forward-viewing camera is connected with the ECU via a first connecting cable. The first connecting cable (i) carries image data captured by the forward-viewing camera from the camera to the ECU, (ii) carries camera control data from the ECU to the forward-viewing camera and (iii) connects a DC power supply of the ECU to the forward-viewing camera for powering the camera. The camera control data is carried by the cable from the ECU to the camera at a control data carrier frequency that is lower than an image data carrier frequency at which image data captured by the camera is carried by the cable from the camera to the ECU.