So yesterday I tried to go out somewhere to try my 4wd out some more and when I pushed the button nothing happened? What's that about? How so I tell what's wrong with my car? No light appears on the dash and I don't hear my 4wd engaging at all. Any ideas?

what  kind of transmission?

 

I mostly know the 3AT - s speed automatic,

Most the time when this happened to me it was the little actuators behind the driver side strut tower. They always seem to go out and all you will here is a clicking noise from them, ive always tested it by pressing the bottom with my hand on them. You will feel it try to work. If nothing continues happening i grab the vacuum line and touch it to manifold pressure. That will let you know if the mechanical part of it is working. One line engahes and the other disengages. It that part works and the actuators are clicking. They are bad. If you get nothing from them its probably something electrical. At that point just start checking fuses. If the actuators are bad i think i have a spare set sitting around. I dont usethem anymore. I went awd... less fuss

Thanks guys! I figured it out. It was a tiny vacuum line that got disconnected some how bUT it's working great now!

Those things tend to slip off in some spots! Little pests if you ask me. That is why i deleted all of them i could!