2005 GMC Safari Owner's Manual - Page 162

Unlocking the Theft-Deterrent Feature After a Power Loss Enter your secret code as follows; pause no more than 15 seconds between steps: 1. Turn the ignition on. LOC will appear on the display. 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. 5. Press AM FM after you 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. If you enter the wrong code eight times, INOP will appear on the display. You will have to wait an hour with the ignition on before you can try again. When you try again, you will only have three chances, eight tries per chance, to enter the correct code before INOP appears. If you lose or forget your code, contact your GM dealer. Disabling the Theft-Deterrent Feature Enter your secret code as follows; pause no more than 15 seconds between steps: 1. Turn the ignition on. 2. Turn the radio off. 3. Press and hold the 1 and 4 pushbuttons at the same time until SEC appears 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. 6. Press HR to make the first one or two digits agree with your code. 7. Press AM FM after you have confirmed that the code matches the secret code you have written down. --- will appear on the display, indicating that the radio is no longer secured. If the code entered is incorrect, SEC will appear on the display. The radio will remain secured until the correct code is entered. When battery power is removed and later applied to a secured radio, the radio will not turn on and LOC will appear on the display. To unlock a secured radio, see Unlocking the Theft-Deterrent Feature After a Power Loss earlier in this section. 3-52