Answers: you won't find any codes.
the hoary body style, you were competent to unlock by manually pressing a bunch of #s if you knew the code,except GM dealer can catch the code for you .
on your particular vehicle , sorry to put in the picture you but you have to purloin it to the dealer for the radio to be reprogrammed. that's the singular way to unlock it....
phone a few dealers surrounded by your vicinity and ask them how much they charge to unlock (reprogram) the radio..
my dealership charges one partly hour labor to reprogram....
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