A vehicular vision system includes an electronic control unit (ECU) configured to connect via a plurality of coaxial cables of a vehicle with a plurality of vehicular cameras of the vehicle. Electrical power for the cameras is carried from the ECU to the respective cameras via respective coaxial cables. The cameras include respective serializers operable to serialize image data captured by the cameras. The cameras include a forward-viewing camera and a rear backup camera. Responsive at least in part to processing at the ECU of de-serialized image data derived from image data captured by the forward-viewing camera, an object present forward of the vehicle is detected. Video images derived at least in part from processing at the ECU of de-serialized image data derived from image data captured by the rear backup camera are displayed at a video display device of the vehicle during a rear backup maneuver of the vehicle.