02 explorer transfer case not shifting?

The guy who rebuilt it said it was the shiter motor on the T case. So i replaced it. and the button now says it is in 4X4 low but not on the dash on the button. it will not shift into auto, high or low but i believe it is still in auto on the T case anyone know what is wrong is it possible that there was nothing wrong with the T casr motor and that it was the 4x4 cm all along? thanks