1997 GMC Suburban Owner's Manual - Page 177

Unlocking the Theft-Deterrent Feature After a Power Loss Enter your secret codeas follows; pauseno more than 15 seconds betweensteps: 1. Turn the ignition to ACCESSORY or RUN. 2. Turn the radio off. 3. Press the 1 and 4 buttons together. Hold them down until SEC shows on the display. 4. Press MN and 000 will appear on the display. 5 . Press MN again to make the last two digits agree with your code. 1. LOC appears when the ignition is on. 2. Press MN and 000 will appear on the display. 3. Press MN 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. 6. Press HR to make the first one or two digits agree with your code. 7. Press AM-FM after you have confirmedthat the code matchesthe secret code you have written down. indicating that the radio is The display will show ---, no longer secured. If the code entered is incorrect, SECwill appear on the display. The radiowill remain secured until the correct code isentered. When battery power is removed and later applied to a secured radio, the radio won't turn on and LOC will appear on the display. 5. Press AM-FM after you have confirmed that the code matchesthe secret codeyou have written down. The display will show SEC, indicating the radio is now operable and secure. If you enter thewrong code eight times, INOP will appear onthe display. You will have towait an hour with the ignition onbefore you can try again. Whenyou try again, you will only havethree chances to enter the correct codebefore INOP appears. If you lose or forget your code, contact your dealer. Disabling theTheft-Deterrent Feature Enter your secret codeas follows; pauseno more than 15 seconds betweensteps: To unlock a securedradio, see "Unlocking the Theft-Deterrent Feature After a PowerLoss" earlier in this section.