How do I know if 4wd is activated? on 2007 Mercury Mariner Hybrid

The graphic has never shown that my car is in 4wd, it only shows the front tires illuminated. I have gotten stuck a couple of times, in my own drive when I was trying to make it go into 4wd. (it never did, had to be dug out). Does your back tires on the graphic light up?

Asked by for the 2007 Mercury Mariner Hybrid