My current keyless entry remote only has the three buttons; lock, unlock, and panic. If I purchase these will I then be able to use the trunk button to open my trunk? Or will the button be useless meaning I will have to use the key or push the infamous trunk button within the glove box still?
Your car should have come with this 4 button style from the factory. It sounds like someone has replaced them in the past with the kind Ford used on trucks and such. If you program these, the trunk feature should work just fine.