its called theft-loc. IF the original owner or any previous owner activated the feature on the radio, anytime the power is disconnected, a code has to be entered for the radio to function again. That code is chosen by whoever first activated the feature, its not just one generic code. It explains all anout it in the manual. If you need it unlocked a dealer can do it for you. I never activated the theftlocs on my GM radios, too much of a hassle.
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