My roommate borrowed my car (2002 Honda Civic EX) and left the lights on, killing the battery. Since then, the stereo says "Code" and when you puch the numeric buttons enough times, it says "Err0". The stereo, cd player or any of the functions will not work. I am assuming I need some sort of programming code, but I purchased the car used and without a manual and cannot figure out what it would be. The cd player/stereo is a factory one. Can anyone help me? I am tired of driving in silence!