The problem with the clock/radio bulb may not be with the bulb itself. I just took my '03 Accord to the dealer for the same or similar problem and it was diagnosed as a short in the radio. Not only did my radio/CD lights not work, but the other lights in the center console didn't work. The dealer replaced the entire radio/CD unit, which solved the problems. Don't know if this is the same sympoms your's is having, but hopefully your warranty is still valid and your dealer will take care of you.
To reset the clock on a 2003 Honda Accord the battery can be disconnected. Another way requires removing the radio fuse located inside the cabin fuse box.
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To set the appropriate code on a radio in a 2003 Honda Accord go to a dealership. Each code is made individually for every car and will need to be reprogramed by a service tech.
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The radio fuse is used for the CD player on a 2003 Honda Accord. To reset the radio pulled the specified fuse out of the fuse box.
Bad clock motor, replace!!!
install a radio
hold clock+seek for Hours hold clock+discs for minutes
Necessary or optional?
check the fuse under the dash
a picture of the radio would be helpful