2004 Honda Civic Owner's Manual - Page 72

Keys and Locks KEY NUMBER TAG MASTER VALET KEYS (Black) KEY (Gray) You should have received a key number tag with your set of keys. You will need this key number if you ever have to get a key replaced. Use only Honda-approved key blanks. These keys contain electronic circuits that are activated by the Immobilizer System. They will not work to start the engine if the circuits are damaged. Protect the keys from direct sunlight, high temperature, and high humidity. Do not drop the keys or set heavy objects on them. The master key fits all the locks on your vehicle. The valet key works only in the ignition and the door locks. You can keep the trunk, trunk release handle and rear seat trunk access locked when you leave your vehicle and the valet key at a parking facility. Keep the keys away from liquids. If they get wet, dry them immediately with a soft cloth. The keys do not contain batteries. Do not try to take them apart. Instruments and Controls 69