2006 Murano SL AWD - AWD light on, runs in FWD

[HmoonMurano]

Hello I own a 2006 Murano SL AWD, love the vehicle, get me out and about just fine, up until recently I noticed from the first snow fall of the year that my AWD SL, is now only running in FWD, has never happened before, I checked the fuse for the AWD and it isn't blown, I also checked the RR diff, and nothing has come unplugged, light just stays on when I drive, and doesn't blink, no other warning light is on, also when I press the AWD lock button nothing comes on, car drives perfectly fine other then it not being in AWD, any one else encounter this problem ? Any ideas of where else I can check to see if maybe something is blown or out ? Any info is greatly appreciated ! Thanks in advance !