A method for controlling a function of a motor vehicle (18) employs a use module (4) at a storage location (6, 8) for a device outside the motor vehicle (18). The use module (4) and the storage location (6, 8) have recognition interfaces (10, 12, 14). The motor vehicle (18) has a first communication module (22), and a second communication module (16) is provided for the use module (4) and for the storage location (6, 8). The recognition interfaces make contact when the use module (4) is at the storage location (6, 8). If a storage location (28, 32) change is registered for the use module (4), a message with an instruction to perform the function of the motor vehicle (18) is transferred from the second communication module (16) for the use module (4) and the storage location (6, 8) to the first communication module (22) of the motor vehicle.