How do you unlock the radio on a 2000 Chevy Malibu?

Answer 1

If you have the security code it's easy. The code is something that either you or a previous owner entered. If you don't have the security code a trip to the dealer will be in your future.
Unlocking the Theft-Deterrent Feature After a Power Loss Enter the code as follows; pause no more than 15 seconds between steps.

1. Turn ON the ignition. 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.

Entering the incorrect code eight times will cause INOP to appear on the display. Wait an hour with the ignition in the ON position before you try again. When you try again, you will have three more chances (eight tries per chance) to enter the correct code before INOP appears.
Deactivating the Theft-Deterrent Feature Enter the code as follows; pause no more than 15 seconds between steps.

1. Turn the ignition to ACC or ON.
2. Turn OFF the radio.
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.
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. The display will show -- -- --, indicating that the radio is no longer secured.

Entering the incorrect code will cause SEC to 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 appears on the display. To unlock a secured radio, refer to "Unlocking the Theft-Deterrent Feature After a Power Loss".