The relay will open when the vehicle commands a change from Charging State to Connected. The vehicle may leave the vehicle in Charging state when unlocking in order not to cycle the relay too many times if it is not sure the session is over. Watch the screen on the station, it will let you know the stat that is commanded by the vehicle.
If the vehicle commands to relay to open by changing state and it does not open a "Stuck Relay" error will be displayed.
Thomas Nielsen