Disabling The Theft Deterrent Feature

In order to disable the theft-deterrent feature, proceed as follows:
IMPORTANT
Do not wait more than 15 seconds between steps.
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 displays.
4. Press MN and 000 will display.
5. Press MN again to make the last two digits agree with the code.
6. Press HR to make the first one or two digits agree with your code.
7. Press AM - FM after you confirm that the code matches the secret code. The display will show "-"indicating that the radio is no longer secure. It the code entered is incorrect, SEC will appear on the display. The radio will remain secured until the correct code is entered.

If the security is activated and the radio is disconnected from battery power, the radio will display "LOC". The radio will not turn on until the correct unlocking code is entered. If the customer code is lost or unavailable, contact your local GM dealership or an authorized Delco radio service center for additional assistance.