Hi. I have a 2000 grand prix. A couple months ago it wouldn't start. I tried disconnecting the battery and hooking it back up. It starts and runs, but the windows, sunroof, radio, and high fan speed do not work. When I turn the fan speed to high, the radio display and windows work for 2 seconds. Any idea on what could be causing this and what to do about it? Also the ABS and trac light is on all the time. Any input would be greatly appreciated, thanks