Unlocking Secured Audio Assembly After Power Loss

If battery power is removed for any reason, "LOC" will appear on the display when power is reapplied. You will need to enter your code to unlock the system. You have only 15 seconds between each of the following steps.
1. Turn the ignition on. "LOC" will appear on the display.
2. Press "MIN" and "000" will appear on the display.
3. Press "MIN" again and hold until the last two digits of your code appear.
4. Press and hold "MR" until the first digit or digits of your code appear.
5. Press "AM/FM" after you make sure the code matches the one you wrote down. "SEC" should appear on the display, meaning you can now use your system, and it is secured.

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.