How do you turn off the theft lock on a 2000 Cadillac sts radio?

To turn off the theft lock on a 2000 Cadillac STS radio, first ensure the vehicle is turned on. Then, press and hold the "Band" and "Seek" buttons simultaneously until the display shows "SEC" (for security). Next, enter the correct code using the radio preset buttons. If you don't have the code, you may need to consult the owner's manual or contact a dealership for assistance.