Abstract: The invention relates to a device for checking the user authorisation for access control devices, in particular locking devices for vehicles. The information emitted by the respective transponder (T1 . . . Tn) in key devices (B1 . . . Bn) in each case is compared to preset information, fixed by the secret code, in the control device, relevant for the respective key device (B1 . . . Bn), whereby(a) the relevant secret code for the respective key device (B1 . . . Bn) is stored, by learning it from the control device (A);(b) the information emitted by the respective transponder (T1 . . . Tn) comprises user code information encoded according to the learned secret code;(c) the control device (A) comprises a further memory means (M) in which the number of the key devices (B1 . . . Bn) taught by the control device (A) is stored; and(d) the key devices (B1 . . . Bn) comprise further memory means (M1 . . .