So a couple months ago I blew up my radio and I bought another OEM radio. I got it unlocked by my mechanic and it turns on but doesn't play sound through the speakers. Does somebody know what it could be. I bought a new amp and that didn't change anything. I know there are two unlock codes, one for the base model with the basic system, and one for the upgraded pioneer system. Could it be that he unlocked it with the base model code and its not activating my system and if so can you relock and change the code on the radio. PLEASE HELP im not trying to go aftermarket, I like the stock look