Hello everyone, I have a Cencom Sapphire in a police cruiser that the control head is no longer working. It beeps when a button is depressed but the backlight will not come on and it will not activate any functions. The error light is on steady which whelen indicates "Cencom controller bus is set to off" I have no idea what that means. Has anyone else had this issue? I did try a working control head out of another cruiser and it still didn't work. Thanks for the help!