I put a different cd player in but now put my stock mach cd back in. It all hooks up and time shows and so forth, but no music will come out. Someone told me it might be like a theft derrent thing and i have to put a code it cause thats what they used to have to do on there old car. I guess what im asking is does anyone know the code for my 2004 mustang gt cd player? I appreciate any help.