Vehicle entry / tire pressure management system comprises a plurality of tire sensor, a plurality of LF antennas, and ECU. Each tire sensors are attached to each tire of the vehicle. Each of the LF antennas are attached to the vehicle, configured to transmit an LF field for returning the two tire sensors. Several antenna, can also be configured to transmit SMART entry LF search field for returning the portable transmission / reception unit for keyless entry of vehicles. The ECU communicates with tire sensor via the receiver, and further communicates with the LF antenna. Or ECU receives the identification signal from the respective tire sensor, or the judgment which antenna a tire sensor for the source of each of the identification signal is restored, the respective identification signal matches the other received identification signal based on the whether the determination, arranged to determine the position of each tire sensor.