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General Motors links the radio's to the body control module for a number of reasons. First is theft derrent, if the radio is stolen it's about as much use as a paper weight.
Second because you can program items on the car, ie: door locks, key fob responses, delayed headlights etc. then the radio has to be matched properly.
Third sensor resets ie: tire pressure monitor, engine oil life, service due etc are also controlled by some models radios.
Usually Delco Remy has an electronics firm contracted that attends the dealerships at given times to attend to sound system problems, and it is usually these firms that preform this work, they charge the dealer, and of course the dealer is going to want their share.
No, it's not something you can do. If it were that easy then the theft deterrent system would not be effective.
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