10 with the associated data exchange in the vehicle 10 in the case of the remote control of a vehicle function namely vehicle locking the data exchange shown schematically in fig4 and fig5 can occur via one or more busses and or via discrete lines or circuits the communication between the unit 20 and the communication unit 40 occurs via the communication unit 25 which is not shown in fig4 and fig5 the data 24 which is received by the communication unit 40 from the unit 20 includes in the example wherein the function is vehicle independent heating as shown in fig4 a starting signal for starting the vehicle heater and a stop signal for stopping the vehicle heater a time signal for setting the starting time of the vehicle independent heater and or the signal for canceling the start time from the vehicle 10 the following status data 42 concerning the vehicle independent heater can be transmitted via the communication unit 40 to the unit 20 status u201c ignition on u201d status u201c remote control of vehicle independent heater deactivated u201d status u201c energy supply insufficient u201d status u201c client programmed temperature cannot be attained by the desired time u201d and or status u201c service activated u201d the data 413 transmitted from the communication device 40 to the display and operating unit 130 includes the signals shown by way of example in fig4 with which.