A/C Heater Control DEAD

I have a 99 Intrigue and the A/C Heater control unit won't turn on. It was working intermitently this past week and then it stopped working all together. So, not only is there no A/C, but no fan or anything...
I got a control unit from a salvage yard for $35, but no luck. So, either both units are bad, or I have a electrical problem somewhere. Either could be possible. Does anyone know how to test at the harness to see if there might be a short of somekind, any help would be appreciated.

Thanks