Where can I find the code? I was playing some music and all of the sudden the lights for the buttons on the cd player started flickering. They then turned off. The car didn't start. I waited a few minutes and the car restarted. Now the cd player is telling me "code error 7" because I tried various codes and nothing.

I'm guessing an issue with the battery that has been resolved but something happened with the cd player where it tells me "code error". Where can I find this code in my car? I can't listen to any music while driving, which sucks. Any help on this?