Radio-based vehicle access system (100), comprising - a data bus system (120), a master module (121) with a master bus transceiver (124), and - at least one first slave module (122a) and one second slave module (122b) of identical construction, which are arranged in a daisy chain configuration with the master module (121), - the first slave module (122a) having a discrete bus activation circuit (127a) has a first switching element (128a), which has on the input side a first slave bus transceiver (125a) and, via this, a first microcontroller (126a) of the first slave module (122a) and the output side has a second slave bus transceiver ( 125b) of the second slave module (122b), and wherein the first switching element (128a) for selectively connecting and disconnecting the second slave bus transceiver (125b) to the master bus transceiver (124) by a voltage signal from the first microcontroller (126a) can be controlled, further on isend- a control device (110) for optionally unlocking and locking vehicle doors, which is connected to the data bus system (120), - the slave modules (122a-122d) of the data bus system (120) being connected via the data bus System (120) are connected to the control device (110), furthermore each have a radio transceiver (123a-123d) connected via the data bus system (110) for transmitting and receiving, in order to transmit a coding key with a radio-based vehicle key located outside the vehicle ( 140) for optional unlocking and locking of vehicle doors.
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