Shut the radio OFF. Hold the button number 4 (mode). While holding the button 4, turn the radio ON. You should get a bar code. Write this bar code down. When releasing, the CODE indicator should appear. Just enter the code you've got (hopefully from dealer). You have 3 chances. Once entered the right code, radio should work. If you see just numbers on the LCD, the unit is locked up. To unlock, you must remove battery for 24 hr and then reconnect it again. When you turn radio ON, the CODE indication should appear again. If its not working, just go to dealer with the bar code in order to get the right code. To enter code, just ue the 1to6 buttons to type it in.