How do you enter anti theft code saab 900?

To enter the anti-theft code for a Saab 900, first turn the ignition key to the "On" position without starting the engine. Then, press and hold the "0" button on the radio until the display shows "Code." Enter the four-digit anti-theft code using the radio preset buttons, then press the "Enter" button or "OK" to confirm. If the code is entered correctly, the radio should unlock and begin functioning again.