You can insert the master key in uncoupling, turn uncoupling on and press uncouple, and then nothing happens.
What did you expect? Should it jump away in the moment of uncoupling? You can see it btw in the left display, where information about motor current and the series number of the units are visible. After uncoupling, it only shows information from the remaining unit(s). Also the headlights automatically turn on when uncoupling - and turn off, when coupling.
That's a good tip, thanks! I expected it to make a sound or something, there was no audio/visual confirmation from the exterior.
