Honda 1992 Accord Coupe Owner's Manual page 82

Theft Protection (US: EX, Canada: EX-R)
Your stereo sound system is protected by a code number. The
system immediately disables itself whenever the radio/player unit is
disconnected from the battery. To make it work again, you must
enter a five-digit code with the station Preset buttons.
Your dealer should have given you t w o copies of your audio system's
code number with your car. Keep one of these copies at home, and
the other in your wallet or a concealed place in the car.
If your car's battery is disconnected or goes dead, the audio system
will disable itself. The next time you turn on the radio you will see
"Code" in the frequency display. Use the Preset buttons to enter
the five-digit code. If entered correctly, the radio will start to play.
You will then have to store your favorite stations in the Preset
buttons. Your original settings were lost when power was
disconnected.