Yesterday, I took my Prius to a parking lot. I normally just give them my entire key fob, however because the guy said he might be leaving early - he had me take the emergency key and he placed the smart key part under the mat so I could unlock the car. However, now when I walk up to my car, it no longer automatically opens. And when I just to start my car without the key in the holder, it doesn't. Did he do something funny? Do I need to reset anything? Do I need to yell at the valet guy?!
There are buttons under the dash, directly under the sterring column to turn the SKS on and off. Maybe he didn't like your tip, or he was a butthead, and turned it off... If it's not that, it's a dead battery in your FOB or your 12V battery may be dying. Especially if it's the original.