Method for controlling a system for a motor vehicle, said system comprising at least: - an actuator, - a volatile memory storing at least one item of actuator position information (IP RAM), - a long-term memory (EPROM) storing: o at least one item of actuator position information (IP ROM), o information relating to the shutdown of the actuator (I HT), this information taking a first value when the system was shut down in a controlled manner and taking a second value when the system experienced a fault that caused the erasure of the current value of the position of the actuator stored in the volatile memory, in particular when the system inadvertently stopped being supplied with electric power or communication between the system and a computer was inadvertently disconnected, said method comprising the following steps: - when the system is activated following a shutdown, determining whether the position value stored in the long-term memory (EPROM) is considered to be correct on the basis of the shutdown information (I HT); - if the position value is considered to be correct, using this value to command the actuator; - if the position value is considered to be incorrect, determining a value of the position of the actuator (before commanding the actuator again); - if the shutdown information (I HT) is equal to the second value, then the position value stored in the long-term memory (EPROM) is considered to be incorrect, and an electronic entity, such as a computer of the vehicle, sends a position value of the actuator to the system; the method being characterized in that the computer sends a position value (v cal) of the actuator to the system that is calculated on the basis of a plurality of positions stored in the computer memory. - an actuator, - a volatile memory storing at least one item of actuator position information (IP RAM), - a long-term memory (EPROM) storing: o at least one item of actuator position information (IP ROM), o information relating to the shutdown of the actuator (I HT), this information taking a first value when the system was shut down in a controlled manner and taking a second value when the system experienced a fault that caused the erasure of the current value of the position of the actuator stored in the volatile memory, in particular when the system inadvertently stopped being supplied with electric power or communication between the system and a computer was inadvertently disconnected, o at least one item of actuator position information (IP ROM), o information relating to the shutdown of the actuator (I HT), this information taking a first value when the system was shut down in a controlled manner and taking a second value when the system experienced a fault that caused the erasure of the current value of the position of the actuator stored in the volatile memory, in particular when the system inadvertently stopped being supplied with electric power or communication between the system and a computer was inadvertently disconnected, said method comprising the following steps: - when the system is activated following a shutdown, determining whether the position value stored in the long-term memory (EPROM) is considered to be correct on the basis of the shutdown information (I HT); - if the position value is considered to be correct, using this value to command the actuator; - if the position value is considered to be incorrect, determining a value of the position of the actuator (before commanding the actuator again); - if the shutdown information (I HT) is equal to the second value, then the position value stored in the long-term memory (EPROM) is considered to be incorrect, and an electronic entity, such as a computer of the vehicle, sends a position value of the actuator to the system; - when the system is activated following a shutdown, determining whether the position value stored in the long-term memory (EPROM) is considered to be correct on the basis of the shutdown information (I HT); - if the position value is considered to be correct, using this value to command the actuator; - if the position value is considered to be incorrect, determining a value of the position of the actuator (before commanding the actuator again); - if the shutdown information (I HT) is equal to the second value, then the position value stored in the long-term memory (EPROM) is considered to be incorrect, and an electronic entity, such as a computer of the vehicle, sends a position value of the actuator to the system; the method being characterized in that the computer sends a position value (v cal) of the actuator to the system that is calculated on the basis of a plurality of positions stored in the computer memory.