I have a 2006 titan 4x4 with the automatic transmission with the shifter is on the column. There is a button on the end of the shift to turn on the manual mode and a toggle switch to shift up and down through the gears but when i press the button nothing happens and I can not shift up or down. Is there a light that is supposed to come on when you turn on the manual mode? any ideas what might be wrong? I looked to see if there was a blown fuse but I do not know which fuse it would be. Any help would be greatly appreciated.