2009 Acura MDX Owner's Manual - Page 239

Main Menu Table Of Contents Radio Theft Protection Your vehicle's audio system may disable itself if it is disconnected from electrical power for any reason. To make it work again, you must enter a specific five-digit code with the preset buttons. Because there are hundreds of number combinations possible from the five digits, making the system work without knowing the exact code is nearly impossible. 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. If you lose the card, you must obtain the code number from your dealer. To do this, you will need the audio system's serial number. If your vehicle's battery is disconnected or goes dead, or the radio fuse is removed, the audio system will disable itself. If this happens, you will see in the audio display the next time you turn on the system. Use the preset buttons to enter the five-digit code. The code is located on the radio code card included in your owner's manual kit. When it is entered correctly, the radio will start playing. If you make a mistake entering the code, do not start over; complete the five-digit sequence, then enter the correct code. You have 10 tries to enter the correct code. If you are unsuccessful in 10 attempts, you must then leave the system on for 1 hour before trying again. The system will retain your AM and FM presets even if power is disconnected. Features 2009 MDX 235