The S-Series was a family of compact cars from the Saturn automobile company. This was the first series of Saturn vehicles. Some model years of the Saturn S-Series have keyless entry remote fob smart keys that are onboard programmable, which means a person can program the keyless entry remote fob smart key with no special equipment other than the keyless entry remote fob smart key programming instructions. However, other model years of the Saturn S-Series are not on-board programmable and require special equipment in order to program the keyless entry remote fob smart key.