The disclosed method enables control of an actuator for winding a blackout screen around a winding shaft. The actuator includes at least one electric motor. The method includes: at least one step that involves using an electronic unit to detect screen locking, during lowering or raising, by detecting a torque exerted by the motor on the winding shaft, the torque being determined on the basis of a current for supplying power to the motor; and a step that involves stopping the motor when a signal representing the detected current is greater than a threshold value. The electronic unit is parametrizable. Moreover, the method includes at least one additional step, used when the signal representing the detected current is less than the threshold value and involving detecting, on the basis of the detected current, a localized change in the shape of the screen, during lowering, by using the same electronic unit.