A method of detecting blocking of a rotor of a motor driving an actuator member to move in translation between first and second abutments that are respectively representative of first and second angular positions of the rotor, the method comprising the steps of: • in a first step, during angular movement of the rotor, estimating at least a position of the actuator member relative to the two abutments, a travel direction of the actuator member relative to the two abutments, and also a travel speed of the actuator member; • in a second step, on the basis at least of the estimated position of the actuator member, of the estimated travel direction of the actuator member, and of the estimated travel speed of the actuator member, detecting: • blocking of the rotor due to the actuator member reaching the first abutment; or • blocking of the rotor due to the actuator member reaching the second abutment; or • blocking of the rotor due to seizing during travel of the actuator member towards the first abutment; or • blocking of the rotor due to seizing during travel of the actuator member towards the second abutment, wherein the second step is implemented with the help of the setpoint data (C*) for the mechanical torque to be delivered, said mechanical torque setpoint being positive and must be less than a mechanical torque threshold (C_max) when the actuator member is moving towards one of the abutments and said mechanical torque setpoint being negative and must be greater than a mechanical torque threshold (C_min) when the actuator member is moving towards the other of the abutments, the mechanical torque thresholds being predetermined so as to avoid mechanical damage to the motor or the actuator member. • in a first step, during angular movement of the rotor, estimating at least a position of the actuator member relative to the two abutments, a travel direction of the actuator member relative to the two abutments, and also a travel speed of the actuator member; • in a second step, on the basis at least of the estimated position of the actuator member, of the estimated travel direction of the actuator member, and of the estimated travel speed of the actuator member, detecting: • blocking of the rotor due to the actuator member reaching the first abutment; or • blocking of the rotor due to the actuator member reaching the second abutment; or • blocking of the rotor due to seizing during travel of the actuator member towards the first abutment; or • blocking of the rotor due to seizing during travel of the actuator member towards the second abutment, wherein the second step is implemented with the help of the setpoint data (C*) for the mechanical torque to be delivered, said mechanical torque setpoint being positive and must be less than a mechanical torque threshold (C_max) when the actuator member is moving towards one of the abutments and said mechanical torque setpoint being negative and must be greater than a mechanical torque threshold (C_min) when the actuator member is moving towards the other of the abutments, the mechanical torque thresholds being predetermined so as to avoid mechanical damage to the motor or the actuator member. • blocking of the rotor due to the actuator member reaching the first abutment; or • blocking of the rotor due to the actuator member reaching the second abutment; or • blocking of the rotor due to seizing during travel of the actuator member towards the first abutment; or • blocking of the rotor due to seizing during travel of the actuator member towards the second abutment, wherein the second step is implemented with the help of the setpoint data (C*) for the mechanical torque to be delivered, said mechanical torque setpoint being positive and must be less than a mechanical torque threshold (C_max) when the actuator member is moving towards one of the abutments and said mechanical torque setpoint being negative and must be greater than a mechanical torque threshold (C_min) when the actuator member is moving towards the other of the abutments, the mechanical torque thresholds being predetermined so as to avoid mechanical damage to the motor or the actuator member.