Method for controlling an operating state of a vehicle, the control method is such that the operating state, initially adopting a locked state ensuring immobilization of the vehicle, can be modified to adopt any of the following unlocking states (E1, E2, E3): - a state of total unlocking authorizing the activation of an operating mode of the vehicle, associated with said state of total unlocking, without restriction, - partial unlocking states (E2, E3) each authorizing the activation of an operating mode associated with said partial unlocking state and allowing restricted activation of the vehicle, and in that the ordering method comprises: - a step of receiving a control instruction requesting the activation of one of the operating modes, - a step of modifying the operating state so as to move it from the locked state to the unlocking state (E1, E2, E3) associated with the operating mode whose activation is requested to authorize the activation of said operating mode, - a step for activating the authorized operating mode; and in that the step of modifying the operating state comprises, after receipt of the control instruction: - a step (E101-1) of transmitting an encrypted key identifying the operating mode whose activation is requested, said encrypted key being transmitted by a first computer of the vehicle to at least a second computer of the vehicle, - a step (E101-2) of receiving the encrypted key by said second computer which results in the transition of the second computer from the locked state to the state (E1, E2, E3) of unlocking associated with the operating mode whose activation is requested to authorize said second computer to provide at least one service participating in the implementation of the operating mode identified by the encrypted key received and characterized in that it comprises a step of issuing the control instruction by a remote control device, said control instruction requesting activation of one of the operating modes associated with one of the partial unlocking states (E2, E3), the first calculator being configured to only send the encrypted key to the second calculator if it has previously received the control instruction and a random number sent by the second calculator, this random number being used to generate the encrypted key to be sent to the side of the first calculator and to determine in combination with the encrypted key received the unlocking state to be applied to said second calculator. - a state of total unlocking authorizing the activation of an operating mode of the vehicle, associated with said state of total unlocking, without restriction, - partial unlocking states (E2, E3) each authorizing the activation of an operating mode associated with said partial unlocking state and allowing restricted activation of the vehicle, - a step of receiving a control instruction requesting the activation of one of the operating modes, - a step of modifying the operating state so as to move it from the locked state to the unlocking state (E1, E2, E3) associated with the operating mode whose activation is requested to authorize the activation of said operating mode, - a step for activating the authorized operating mode; and in that the step of modifying the operating state comprises, after receipt of the control instruction: - a step (E101-1) of transmitting an encrypted key identifying the operating mode whose activation is requested, said encrypted key being transmitted by a first computer of the vehicle to at least a second computer of the vehicle, - a step (E101-2) of receiving the encrypted key by said second computer which results in the transition of the second computer from the locked state to the state (E1, E2, E3) of unlocking associated with the operating mode whose activation is requested to authorize said second computer to provide at least one service participating in the implementation of the operating mode identified by the encrypted key received - a step (E101-1) of transmitting an encrypted key identifying the operating mode whose activation is requested, said encrypted key being transmitted by a first computer of the vehicle to at least a second computer of the vehicle, - a step (E101-2) of receiving the encrypted key by said second computer which results in the transition of the second computer from the locked state to the state (E1, E2, E3) of unlocking associated with the operating mode whose activation is requested to authorize said second computer to provide at least one service participating in the implementation of the operating mode identified by the encrypted key received and characterized in that it comprises a step of issuing the control instruction by a remote control device, said control instruction requesting activation of one of the operating modes associated with one of the partial unlocking states (E2, E3), the first calculator being configured to only send the encrypted key to the second calculator if it has previously received the control instruction and a random number sent by the second calculator, this random number being used to generate the encrypted key to be sent to the side of the first calculator and to determine in combination with the encrypted key received the unlocking state to be applied to said second calculator.