I have a 2006 Dodge Ram 2500. Last winter I had the lights in the heater control module in the dash start to go out. They finally quit working, along with my mirror defroster switch and being able to adjust where the heat comes out. (Dash, floor or windshield). I replaced the control module in the dash to find that not only do I still do not have the mirror defroster or the ability to change where the heat comes out but the AC button does not work either. Any ideas of what to check now?