txleex08

So the headunit on my 2002 finally called it quits. I recently bought a 2005 head unit from ebay and installed it using directions from the forum. Everything is plugged into place; however, neither Tape nor CD players work. The AM/FM radio works fine. Is there a code you have to punch in to get both players working? I even disconnected the battery to reset the car ecu. I need your insight. Thanks.