I am trying to install a Pioneer DEH-X6500Bt into my girlfriend's 2008 Chevy Cobalt LT. BUT... I didn't go out and buy the wire harness. So like i have done 3 or 4 times before i just cut the Old Plug for the factory Cd player and wired it all up with the New Plug, plugged it into the cd player and reconnected the negative cable to the battery. Well the cd player turns on and says it is playing my ipod and the radio but no sound at all. Yes i get i should have just went out and got the Harness. But without that does anyone have any idea what i should be looking into?