Method for controlling a vehicle , said control method comprising a step (E100) of implementing a first mode (F1) of operation of the vehicle for which the vehicle operates at least partially, the first mode (F1) of operation being associated with an operating state (Ef) of the vehicle authorizing said implementation of the first mode (F1) of operation, said method comprises: - a step (E101) of periodic monitoring of the occurrence of an event (Ev_1) during the step (E100) of implementing the first operating mode (F1) to detect the event (Ev_1), - a step (E102) of modification of the operating state (Ef), triggered by the detection of the event (Ev_1), to authorize the activation of a second mode (F2) of operation of the vehicle associated with the modified operating state (Ef), - a step (E103) of activation of the second operating mode (F2) of the vehicle authorized by the modified operating state (Ef) and in that the vehicle comprises a first computer providing at least one service during the step (E100) of implementing the first mode (F1) of operation and a second computer ensuring the management of the vehicle , and in that the monitoring step (E101) comprises: - a periodic sending (E101-1), preferably at regular intervals, of a first message (M1) by the first computer to the second computer , - each time a first message (M1) is received by the second computer , a sending (E101-2) of a second message (M2) sent by the second computer to the first computer , - upon each reception of a second message (M2) by the first computer , processing (E101-3) of said second message (M2) by the first computer triggering the implementation of step (E102) modification of the operating state (Ef) when the second message (M2) indicates that the event (Ev_1) has occurred, characterized in that each first message M1 comprising a random seed generated by the first computer 103, when the second calculator 104 receives the first message M1, it uses the random seed contained in the first message M1 to generate an encrypted key forming information to be sent to the first calculator 103 via a second corresponding message M2. - a step (E101) of periodic monitoring of the occurrence of an event (Ev_1) during the step (E100) of implementing the first operating mode (F1) to detect the event (Ev_1), - a step (E102) of modification of the operating state (Ef), triggered by the detection of the event (Ev_1), to authorize the activation of a second mode (F2) of operation of the vehicle associated with the modified operating state (Ef), - a step (E103) of activation of the second operating mode (F2) of the vehicle authorized by the modified operating state (Ef) - a periodic sending (E101-1), preferably at regular intervals, of a first message (M1) by the first computer to the second computer , - each time a first message (M1) is received by the second computer , a sending (E101-2) of a second message (M2) sent by the second computer to the first computer , - upon each reception of a second message (M2) by the first computer , processing (E101-3) of said second message (M2) by the first computer triggering the implementation of step (E102) modification of the operating state (Ef) when the second message (M2) indicates that the event (Ev_1) has occurred, characterized in that each first message M1 comprising a random seed generated by the first computer 103, when the second calculator 104 receives the first message M1, it uses the random seed contained in the first message M1 to generate an encrypted key forming information to be sent to the first calculator 103 via a second corresponding message M2. <EOS>