Have you checked the original owners manual? Had this happen with my CRV. The number will be a 5 digit number and will probably be written in the information at the very front of the manual. Try any 5 digit numbers that you see there. Thats how I got mine working again. Good luck.
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Radio code to unlock,Check the attached links,instruction and guides, Good luck
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Try to locate the unique code number that will unlock the theft-protected audio system on your 2003 Honda Civic. It probably was imprinted on an anti-theft identification card that you should have received when you acquired the car. The code was printed on a document that came with your owner's manual packet
If you do not have the code, you will need to track down the audio system's serial number. In the case of the 2003 Honda Civic, finding the serial number may require seeking assistance from a Honda dealer. The dealer should be able to determine the audio system's special code number so you can reset the radio. With some newer Honda Civic models, the serial number can be retrieved electronically from the radio.
If you are able to locate the serial number of your 2003 Honda Civic's audio system without a dealer's assistance, you can obtain the special code by going online to the Honda Web site. You must first provide specific information to prove you own the car. For instance, you will need the Civic's vehicle identification number, or VIN, and the audio system's serial number.
When you know what the audio system's special code number is, use the preset buttons on the car radio to punch in the digits. This should reset the audio system, enabling you to resume using the radio and the CD player.
Read more: How to Reset Radio Information on a 2003 Honda Civic ' eHow.com http://www.ehow.com/how_6056947_reset-information-2003-honda-civic.html#ixzz1FGPZq81d
HAVE TO FIND OUT WHY MY 2003-2005 HONDA CIVIC RADIO DOES NOT WORK. REMOVE BATTERY LAST WEEK AND RECODED THE RADIO. WORK FOR A FEW DAYS AND IS DEAD TO THE WORLD. HOW CAN I TAKE THE RADIO/CD UNIT OUT OF THE DASHBOARD WITH EASE. HOW CAN I TAKE THE RADIO/CD OUT AND IN ?