How do you unlock the radio on a 1998 Chevy blazer?

To unlock the radio on a 1998 Chevy Blazer, you'll need the security code that was originally provided with the vehicle. If you don’t have it, check the owner’s manual or contact a Chevrolet dealership for assistance. Once you have the code, turn on the radio, press the "AM/FM" button, and use the preset buttons to enter the code. After entering the correct code, the radio should unlock and function normally.