A vehicular vision system includes a camera disposed at a vehicle and having a field of view exterior of the vehicle, a light source disposed at the vehicle and operable to emit light, and a control. Light emitted by the light source, when operated, illuminates a field of illumination exterior of the vehicle, with the field of view of the camera encompassing at least a portion of the field of illumination. The control, responsive to data processing by a processor of the control of image data captured by the camera, determines a change in the field of illumination provided by the light source. Responsive to the determined change in the field of illumination, the control at least one selected from the group of (i) adjusts the light source to accommodate the determined change, (ii) adjusts the camera to accommodate the determined change and (iii) generates an alert.