If the radio is reading INOP, then you are entering the wrong code, or not following the correct procedure.
If these steps do not work then you have to contact a GM dealer.
Enter your secret code as follows.
Pause no more than 15 seconds between these steps.
1 LOC appears when the ignition is on.
2 press MIN and 000 will appear on the display.
3 press MIN again to make the last two digits agree with your code
4 press HR to make the first one or two digits agree with your code.
5 Press AM-FM after ou have confirmed that the code matches the secret code you have written down. The display will show SEC, indicating the radio is now operable and secure.
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Saturday, January 3rd, 2009 AT 9:15 PM