This is an older model from maybe 2003-ish. My father bought his truck used and he stumbled onto starting it once and can't figure it out again. The remote is a basic looking sorta gm style fob. Top two buttons are red. Left is lock right is unlock. Bottom left button is green with a car trunk on it with a backslash and a key pic. Bottom right button says option and is gray. No LCD screen or anything fancy. Any help would be great.