I am having problems with my '02 Silverado 3500 instrument cluster. It started yesterday. I know it is not the cluster because I tried it in another truck and it worked just fine. I have tried a to scan the codes, but I cannot get it to communicate with the truck. All fuses and relays are good. This is what it is doing: Lights ON: ABS AirBag Security Battery Low Fuel Gauges Don't Work: Fuel Temp Trans Temp Automatic headlights do not work. Tow/Haul mode does not work. High Beam Indicator does not Work. Gear Indicator does not work.