On my 2012 Prius V that has every available option, last night while driving a green light showed up on the far right hand side of the dash panel. It looks suspiciously like a snowflake. I cannot find but one reference to it that says it is something called "winter mode." But I cannot find anything at al about it. How did it turn on? How do I turn it off? Temps here have been above 70 degrees for weeks so winter is nowhere close by!