There's this book that comes with your car called an "owner's manual." Most people apparently don't know they exist. It usually lives in that place where you store napkins and other junk, over in the passenger's seat area, commonly known as a "glove box."
Inside this magical tome of automotive information, there should be something called an "index." Look in there for "fuse." If your manual doesn't suck (being Honda, it shouldn't) it will provide some sort of diagram that will show you which fuse is for what components.
You can usually find the fuse for the cig lighter itself, and use that. Alternatively, use the radio, or any other device that you know LOSES power when the key is off.
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