i just purchased a 2000 chevy impala which had a am/fm cassette which obviously had to go, and my buddy who owns a body shop had a factory am/fm/cd from an 03 chevy malibu that he once owned so i put the new factory radio in and im getting a locked message. what code do i put in to get my radio to work? thank you for your time. other info if needed that i found on the radio part# 09394149 theres also a number on the bottom not sure what it is for but its *89DDSUM303471066* ANY HELP IS GREATLY APPRECIATED AND THANKS AGAIN.