no heater display/heat

I am working on a 00 intrique. the display for the heater controles comes on and off. i tryed to replace the controle unit with a known good one, i still get the same results. i am woundering if it could be the (bcm) body controle modual. let me know if any of you have had this problem and if you have any ideas to solve it.
thanks

I recall reading someone else's thread a while back about a bad ground at the module in the dash. You might want to dig through the archives.