In active or passive mode, it doesn't matter, only one element tells you whether or not to winterize your pool. And that element is the water temperature. To do this, it must be at 15°C or even slightly below for a few days.
If you do this while it is warmer, algae and bacteria could grow in your pool when the filtration system is down or not at all. However, if the water turns green, there is a great risk that you will have to empty your pool in the spring. Therefore, make sure that the water temperature is stabilized below 15° C to start wintering.