When I try to put my 2008 Patriot in full time 4 wheel drive, it does not activate and the dash light located just under the speedometer does not come on. Another 4 wheel drive light on the dash has come on and does not go out. This light located with the ESP light has no function with my Jeep. I think the all wheel drive is still working but cannot lock in the 4 wheel drive. Could it be a fuse?