Method for checking the seat occupancy of one or more vehicle(s) by passengers using a checking device for checking seat occupancy, the vehicle comprising a plurality of seats equipped with a reading light, the checking device comprising each reading light, a control system for checking the reading lights and a controller, the method comprising: - a step of transmitting at least one piece of data relating to a seat to an electronic device of a passenger of the vehicle, the data being transmitted according to a wireless optical communication technique, the technique being the visible light communication technique, the transmission step being implemented by the reading light of the seat controlled by the control system, wherein, when the seat is reserved, the method includes a step of transmitting by the control device data relating to the state of the seat for the passenger, said data being either data authorising the use of the seat by the passenger when the passenger is the passenger who reserved the seat or data prohibiting the use of the seat by the passenger when the passenger is different from the passenger who reserved the seat, characterised in that the data relating to the seat comprises an identifier of the seat, the method also including: - a step of receiving an identifier of the passenger transmitted by the electronic device of the passenger to the controller; and - a step of generating the data relating to the state of the seat for the passenger by the controller, the generating step including a step of comparing the identifier of the passenger who reserved the seat and the identifier of the passenger. the method comprising: - a step of transmitting at least one piece of data relating to a seat to an electronic device of a passenger of the vehicle, the data being transmitted according to a wireless optical communication technique, the technique being the visible light communication technique, the transmission step being implemented by the reading light of the seat controlled by the control system, wherein, when the seat is reserved, the method includes a step of transmitting by the control device data relating to the state of the seat for the passenger, said data being either data authorising the use of the seat by the passenger when the passenger is the passenger who reserved the seat or data prohibiting the use of the seat by the passenger when the passenger is different from the passenger who reserved the seat, - a step of transmitting at least one piece of data relating to a seat to an electronic device of a passenger of the vehicle, the data being transmitted according to a wireless optical communication technique, the technique being the visible light communication technique, the transmission step being implemented by the reading light of the seat controlled by the control system, wherein, when the seat is reserved, the method includes a step of transmitting by the control device data relating to the state of the seat for the passenger, said data being either data authorising the use of the seat by the passenger when the passenger is the passenger who reserved the seat or data prohibiting the use of the seat by the passenger when the passenger is different from the passenger who reserved the seat, characterised in that the data relating to the seat comprises an identifier of the seat, the method also including: - a step of receiving an identifier of the passenger transmitted by the electronic device of the passenger to the controller; and - a step of generating the data relating to the state of the seat for the passenger by the controller, the generating step including a step of comparing the identifier of the passenger who reserved the seat and the identifier of the passenger. - a step of receiving an identifier of the passenger transmitted by the electronic device of the passenger to the controller; and - a step of generating the data relating to the state of the seat for the passenger by the controller, the generating step including a step of comparing the identifier of the passenger who reserved the seat and the identifier of the passenger.