2006 Nissan Altima Emergency Lights on automatically. canno

I went for shampoo wash of my car interior today. After I came back, my emergency parking lights turned on automatically and I cannot switch it off when I tried. I order to avoid to battery drain I disconnected the battery today hopping it may go well tomorrow when any short circuit due to wetness will go off. If it does appears tomorrow too, what should I do? Should I have to go to dealer or I can do it myself? Any help is appreciated. My car is 2006 model Nissan Altima 2.5S.