Audi A6L Q7 MMI control system of the vehicle entertainment system is a very important human switching control unit, on the Audi, this control mechanism is named as E380, a separate control unit, due to the installation location, design and other factors, MMI often appear out of control, control switch system failure, MMI does not start, function selection key failure and many other issues, there is a serious discharge, MMI system suspended animation, black screen after startup, failures and other control options menu.