The previous listed procedure did not work for a 2009 radio I am replacing in my 2010 Impala. No numbers on the buttons. My radio glass front broke and the display was no longer showing, and the radio started shorting out. I called a local salvage yard, and they had a 2009 Impala come in (with the USB hookup) and that I could have the radio. Now! the blasted thing is locked....... how do you unlock? dealership wants $100 to unlock it. Thats robbery!