The invention relates to a method for monitoring access to electronically controllable devices, in particular vehicles. A communications connection is established between a mobile communications device and a central control platform. An entry for an electronically controllable device is created in the central control platform, and first data are transmitted to the mobile communications device. In addition, second data are transmitted from the central control platform to the mobile communications device, wherein the second data are signed and encoded with an individual key in the central platform before transmission, which key is associated with an access-control unit in the electronically controllable device. The mobile communications device is wirelessly coupled to the access-control unit of the electronically controllable device, wherein at least the second data are transmitted to the access-control unit. The access-control unit verifies and decodes the second data and adapts the configuration of access-control unit in accordance with the decoded data. An authorisation for access to the vehicle is subsequently checked.