A method for performing a security function of a vehicle and system for carrying out the method

The invention relates to a method for performing a security function of a vehicle (2), wherein by means of at least a communication system (3) data to a control unit (4) of the vehicle (2) are transmitted, by means of the control unit (4) generates control signals and a functional unit (5) of the vehicle (2) are transmitted, wherein the safety function in dependence is performed by the control signals by means of the function unit (5), said diagnostic tests are repeatedly performed at intervals of time, it being checked with the diagnostic tests, whether in one or in several used for performing the method of electrical, electronic and / or programmable systems (3-13) is a disorder that can affect the implementation of the safety function, wherein by means of the communication system (3) are transmitted metadata of the data to the control unit (4) , the metadata information on the include systems used for carrying out the method, wherein by means of the control unit (4) where by means of the control unit (4) is checked in dependency of the at least one reliability value, at least one reliability value of the data is determined by using this information, whether the transmitted data for the performing the safety function are out-reaching reliable. The invention also relates to a corresponding system as a whole (1) for performing a safety function of a vehicle (2).