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Chad, I am not a GM mechanic but this procedure works on my '02 K1500 & '03 K2500HD, don't know about others. If the early steps do not match your radio, call the nr in step 7 anyway, there may be some guidance in the introduction. Joe GM Delco Theft-Loc Radio Bypass 01. Turn the ignition ON (The radio displays LOC) 02. Hold down the Radio Presets 2 and 3 buttons for six seconds 03. 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 button 05. 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 form STEP 05 07. Call 1 800 537 5140 08. Press 139010 then # (pound). You will be asked to enter your four or six digit code followed by * (start) 09. Enter the number from STEP 6 then * (star) 10. Listen to the four-digit number and write it down. It will be repeated twice 11. Turn the ignition ON (The radio displays LOC) 12. Use the MN and HR buttons to enter the code from STEP 11 13. Press the AM/FM button. The radio display changes to SEC
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