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`.OK, Here is the Procedure to unlock the system:
01. Turn the ignition ON (The radio displays LOC)02. Hold down the Radio Presets 2 and 3 buttons for six seconds03. The radio display changes from LOC to a three-digit number. Write this number down. Don't take forever, fifteen seconds max before the next step.04. Press the AM/FM button05. The radio display changes to another three-digit number. Write this number to the right of the first one.06. You now have a six-digit number, the first three digits are from STEP 03 and the last three digits are from STEP 0507. Call 1(NNN) NNN-NNNNbr/>08. Press 1 then #. You'll hear Invalid Code, try again09. Press 139010 then #. You will be asked to enter your four or six digit code followed by *10. Enter the number from STEP 6 then *11. Listen to the four-digit number and write it down. It will be repeated twice12. Turn the ignition ON (The radio displays LOC)13. Use the MN and HR buttons to enter the code from STEP 1114. Press the AM/FM button. The radio display changes to SECYour radio is now un-locked and usable
or here is another version, but similar;
1. Press and hold presets 2 and 3 for about 5 to 10 seconds until you get 3 digits on your display. This is the first 3 of 6 digits you will need, so write 'em down. (mine were 881) 2. After doing step one and writing down the code, immediately press the AM/FM button to get the last 3 of the 6 numbers you'll need, and write 'em down. (if you wait too long between steps 1 and 2 and the LOC code displays again, just start over). (mine were 322) 3. Call this number, it's a prerecorded message, so don't worry about having to talk to anyone...1-800-537-5140. The voice will ask if you're calling for Chevy, Pontiac, Cadillac, etc... When you hear this, press 1 for chevy, followed by 02107and hit the * key. (i.e. 102107*) He'll ask you for the 6 digit code that you've written down.(mine was 881 322) Enter that and press the * key. He will then give you a code,(mine was 810 891) 4. To unlock the radio: A. Turn the ignition on. B. Press "SET" (000 appears on display). C. Press "SEEK until the first digit of the code appears. D. Press "TUNE" until the second and third digits E. Press "AM-FM" (000 appears on display). F. Press "SEEK" until the fourth digit of the code appears. G. Press "TUNE" until the fifth and sixth digits of the code appear. H. Press "AM-FM". Now the radio can be turned on.`Hope that helps.