Method for determining the position of a mobile BLE device relative to a vehicle, wherein the mobile BLE device has a BLE interface and the vehicle has a system of BLE interfaces (5, 6, 7, 8, 9, 10, 11, 12), wherein the system of BLE interfaces (5, 6, 7, 8, 9, 10, 11, 12) comprises a BLE central interface as a central communication unit for generating an encrypted or unencrypted data exchange with the mobile BLE device as a basis for detecting signal strengths at least at one position of a first BLE satellite interface and comprises the first BLE satellite interface, wherein each BLE interface has an antenna and, as far as a reference to a position of the BLE interface is made, the position of the antenna of the BLE interface is meant, wherein the first BLE satellite interface comprises a sniffer module or is coupled to the sniffer module to enable the first BLE satellite interface to listen to BLE communication between BLE interfaces, the method comprising the following steps: - Activating the Sniffer Module, - establishing a connection between the BLE central interface and the BLE interface of the mobile BLE device, - listening to the establishment of the connection between the BLE central interface and the mobile BLE device by means of the sniffer module of the first BLE satellite interface - after listening to the establishment of the connection, determined transmission parameters are used to listen to a communication between the BLE central interface and the BLE interface of the mobile BLE device in connection mode, - as soon as the communication of the BLE central interface with the mobile BLE device takes place in connection mode, repeatedly detecting the signal strength of data transmitted by the BLE interface of the mobile BLE device at the position of the first BLE satellite interface and evaluating a plurality of signal strengths successively detected at the position of the first BLE satellite interface of data transmitted by the BLE interface of the mobile BLE device for determining the position of the mobile BLE device relative to the vehicle. comprises a BLE central interface as a central communication unit for generating an encrypted or unencrypted data exchange with the mobile BLE device as a basis for detecting signal strengths at least at one position of a first BLE satellite interface and comprises the first BLE satellite interface, - Activating the Sniffer Module, - establishing a connection between the BLE central interface and the BLE interface of the mobile BLE device, - listening to the establishment of the connection between the BLE central interface and the mobile BLE device by means of the sniffer module of the first BLE satellite interface - after listening to the establishment of the connection, determined transmission parameters are used to listen to a communication between the BLE central interface and the BLE interface of the mobile BLE device in connection mode, - as soon as the communication of the BLE central interface with the mobile BLE device takes place in connection mode, repeatedly detecting the signal strength of data transmitted by the BLE interface of the mobile BLE device at the position of the first BLE satellite interface and evaluating a plurality of signal strengths successively detected at the position of the first BLE satellite interface of data transmitted by the BLE interface of the mobile BLE device for determining the position of the mobile BLE device relative to the vehicle.