Switch On Ignition (No Need To Start Engine) Turn Off Stereo Press & Hold Preset " AS " and Switch Radio On - Display Shows " SAFE " And Then Shows " 10 - - - - " Press preset " 1 " repeatedly for 1st Digit Press preset " 2 " repeatedly for 2nd Digit Press preset " 3 " repeatedly for 3rd Digit Press preset " 4 " repeatedly for 4th Digit If the correct code number is now shown Press & Hold Preset " AS " Until the Unit Beeps