Since automakers haven't standardized their remote key fob programming procedures, check your owner's manual for instructions or consult ProgramYourRemote.com to see if your car's procedure is listed. Entering a car's programming mode requires a sort of rub-your-tummy-pat-your-head sequence that usually involves turning the key one click to enter Accessory mode (the one lets you listen to the radio when the engine's off) a few times, plus other machinations.