We bought this Yukon about 2 months ago. Since it had some minor problems I have been slowly fixing them as I go. The newest thing on my list is the DIC. I can get it to show me the miles and by pushing the trip button mounted in the cluster. But none of the control buttons on the wheel work. Only one lights up at night. I figured the bulbs were just burnt out. But why would the Buttons not work when pushed?