The present disclosure relates to a method for controlling a data interchange between a control device of a motor vehicle and an external device. The motor vehicle has multiple vehicle functions each having at least one associated subservice. Based on the subservice, the respective vehicle function is performed and the data interchange with the external device takes place independently of the activity of the vehicle function. If the control device receives a deactivation signal for one of the vehicle functions, it deactivates this at least one vehicle function and checks whether one of the subservices is associated with at least one other vehicle function that is currently activated. If a subservice is not associated with a currently activated vehicle function, this subservice is deactivated, as a result of which the data interchange between the control device and the external device is terminated by this subservice.