METHOD FOR OPERATING AT LEAST ONE FUNCTION OF A MOTOR VEHICLE BY MEANS OF A PORTABLE KEY DEVICE AND KEY DEVICE

A method for operating a motor vehicle. A user of the motor vehicle is authorized to trigger at least one function by a portable key device. For this purpose, the key device has an identification code that uniquely identifies the key device, and an authorization data set that describes the at least one function for which the user is authorized by the key device identified by the identification code. A control device of the motor vehicle carries out the receiving of the authorization data set and the identification code from the key device. In addition, based on an identification code stored in the control device and an authorization data set stored in the control device, it is determined whether the received authorization data set and the received identification code correspond to a predetermined combination. If they correspond to the predetermined combination, an enabling of the at least one function occurs.