I have a 2004 Chevy Cavalier, 4 door, I had it jump started a couple of times, and it locked my stero,/ Cd Player, I have tried everything, You are not able to do anything with it, it just says locked on it, I have tried to get any codes to come up but they don't, If I push any buttons, I also don't have the codes to it or manuel to it, pleae help. Don't have the money to take it to the dealer, Thanks,