Patent ID: 7623948

Claim:
A method of communicating between a motor vehicle and a diagnostic unit wherein a wireless communication connection is established between the motor vehicle and the diagnostic unit after an authorization of the diagnostic unit has been checked, the method comprising the acts of: connecting the diagnostic unit with a vehicle key assigned to the motor vehicle; and checking for an authorization of the diagnostic unit by way of authorization data stored in the vehicle key, wherein the diagnostic unit includes at least one device for wirelessly communicating with the motor vehicle, the authorization data are transmitted from the vehicle key to the diagnostic unit by way of a communication connection between the diagnostic unit and a vehicle key reading device in which the vehicle key is placed, a session key for coded communication between the motor vehicle and the diagnostic unit is generated on the basis of the received authorization data, and a coded communication connection is established using the session key, and once established, the coded communication connection is maintained independent of whether the vehicle key remains in communication with the vehicle key reading device.