Electrical problem
1999 Pontiac Firebird 6 cyl Two Wheel Drive Automatic

MY DOME LIGHTS WILL NOT COME ON WHEN THE DOORS ARE OPENED UP NOR WILL THEY COME ON BY THE TURNING OF THE DOME LIGHT SWITCH ON THE DASH. I TESTED THE 12V WIRE AND IT IS STILL HOT SO I HAVE DECIDED THAT IT IS NOT SEEING A GROUND TO TURN THEM ON. I FOUND A BCM AT THE SALVAGE YARD OUT OF A 1997 FIREBIRD WHICH WORKS ON THE 97-02 MODELS AND WHEN I DISCONNECTED THE ORIGINAL BCM AND CONNECTED THE SALVAGED ONE IN ITS PLACE THE DOME LIGHTS INSTANTLY CAME ON. SO MY PROBLEM IS FOR SURE IN THE BCM, IS THERE ANY REASON WHY I CANT USE THE SALVAGE BCM IN MY BIRD ANY DIFFERENCE IN THE 2 BCM'S AT ALL?