AWD doesn't seem to be working

Hello, If you have a patch of snow and ice you can drive onto, see if the wheels all spin if you tap the throttle. I am not asking that you go sliding all over, just that you see the reaction of the wheels. If you are not seeing warnings on the dash, the chances are your 4wd is working, but it only fully engages from necessity. Your tires may just not be good for snow and ice, also. Either way, let me know what happens, and if you have any warning lights on, etc..