1. A vision system for a vehicle, said vision system comprising: an imaging device having an imaging sensor; a camera microcontroller; a display device having a display element; a display microcontroller; at least one user input selectively actuatable by a user; and wherein said imaging device communicates an image signal to said display device via a communication link, said display microcontroller affecting said image signal in response to said at least one user input, said camera microcontroller monitoring said image signal on said communication link and adjusting a function of said imaging device in response to a detection of said affected image signal, wherein said display microcontroller affects said image signal by disabling a video termination at said display device.