Headlight washing system Winter operation

Hello together, the winter is approaching and thus the danger of freezing the cover plate of the headlight cleaning nozzles on the bumper. I know, the topic has already been given, but that was 2009. Maybe Volvo has improved since then! Does one of you know whether the last models (production April / May 2012) have the possibility to deactivate the headlight nozzles? Is it actually the case that the water pressure pushes the nozzles up. If yes (they are activated 2 times in a row), this probably controls an electronics, which can actually also be switched off. Where is the water supply interrupted? Splash, provided the liquid is frost-proof (-30 °), if the plastic cover is frozen because the nozzle the liquid is in the bumper? In any case, it is annoying if I just want to have a splash of water on the windows for a short time and the cleaning system then resows the once clean car! Would be nice if you can give me some answers. Love greetings and an accident-free ride. V50 Fan