Anytime you replace the carriage or vehicle mgrs. you'll need to run learn on all systems on the 537, incl. carriage, height, weight, controls, etc., Have you flipped the toggle on the vehicle mgr. to program and pushed the little red reset button beside it? I have had times when this was the only way to get to the menu needed. Alos, is the primary display on the mini-mast damaged at all. If so, open the door to access the back of the card and disconnect there or better yet, directly at the carriage mng. to take this display out of the equation.