so i brought my car to a shop to get my rotors changed and a sensor in my air intake.my cd player worked fine on the way there,but when i got it back from them it didn't work any more.the radio works fine but any thing to do with the cd player does not.i called them and asked y, they said they had the door open and my battery died,and it may have tripped the theftlock. it dosent say LOCKED like it said it would in the manual. i called my dealer and they said i have to bring it there for they can type in a code to unlock it.does any one know whats going on with this.will this happen every time my battery dies or unplug it?any help would be grate,i miss my cd player and don't like listening to my poopy brakes. :(