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You have undoubtedly changed batteries or run the battery down. The display LOC means the radio is locked. You will have the insert the proper code to active the radio. If you cannot find the code, contact your GM dealer. Head on over to www.DelcoLockCodes.com. They charge $4.99 for the code but they got back to me in an hour or so and the code worked perfectly. Better than paying a dealer $40 - $50!

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16y ago

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