1994 Honda Civic Owner's Manual - Page 79

Audio System On U.S. EX and Canadian Si models Your car's audio system will disable itself if it is disconnected from electrical power for any reason. To make it work again, the user must enter a specific five-digit code in the Preset buttons. Because there are hundreds of number combinations possible from five digits, making the system work without knowing the exact code is nearly impossible. You should have received two copies of a card that lists your audio system's code number and serial number. It is best to store one of these cards in a safe place at home, and to keep the other in your wallet or purse. In addition, you should write the audio system's serial number in this Owner's Manual. If you should happen to lose both cards, you must obtain the code number by having your Honda dealer contact American Honda. To do this, he will need the system's serial number. If your car's battery is disconnected or goes dead, the audio system will disable itself. If this happens, you will see "Code" in the frequency display the next time you turn on the system. Use the Preset buttons to enter the five-digit code. If it is entered correctly, the radio will start playing. If you make a mistake entering the code, do not start over or try to correct your mistake. Complete the five-digit sequence, then enter the correct code. You have three tries to enter the correct code. If you are unsuccessful in three attempts, you must then leave the system on for one hour before trying again. You will have to store your favorite stations in the Preset buttons after the system begins working. Your original settings were lost when power was disconnected. Comfort and Convenience Features