2011 Honda Odyssey Owner's Manual - Page 416

Radio Theft Protection On all models except LX If your vehicle's battery is disconnected or goes dead, or the radio fuse is removed, the audio system will disabled itself. If this happens, there are two methods to make it work again. Turn the ignition switch to the ON (II) position, press the power/volume knob once. The enter code screen will appear. Vehicle Specific Method Press and hold the power/volume knob for a few seconds, the audio unit will check the VIN information stored in the vehicle. The audio system will start activating if the VIN information stored in the audio system and the vehicle match. Security Code Method The enter code screen will appear. Use the preset buttons to enter the five-digit code. The code is on the radio code card included in your owner's manual kit. When it is entered correctly, the radio will start playing. You should have received a card that lists your audio system code number and serial number. It is best to store this card in a safe place at home. In addition, you should write the audio system's serial number in this owner's manual. Features If you make a mistake entering the code, do not start over; complete the five-digit sequence, then enter the correct code. You have ten tries to enter the correct code. If you are unsuccessful in ten attempts, you must then leave the system on for 1 hour before trying again. If you cannot activate the audio system, and lose the card, take the vehicle to your dealer. 2011 Odyssey 413