L2005gt

hey i just recieved a 2006 6cd changer unit for my 2005 legacy from member "leggnut" and after the install all that came up was AC and AUTO in te lower display panel. no controls work or light up and i get a slight hum in the speakers thats about it. it has a aux board tat e said was from and you and told me to ask you to see if u could help. if u could give me any directions that would be great. thanks

keith