On the SR5 and Sport, there is no auto on feature for the headlights. On the other hand, all of the models (SR5, Sport, Limited) have the auto off feature where the lights either go off when you open the driver door, 30 seconds after the driver door is opened, or when you hit the lock button twice (Toyota keyless entry). The dealer has to program it the way you want it. From the factory, all of them come with the lights going off 30 seconds after the driver door is opened. The 30 minute thing is a feature on all models as well. The purpose of that is to not let the battery drain down. The extra feature that the Limited has is the auto on feature. That is just an extra selector on the lights switch that turns the lights on when it gets dark out. I hope that clears up everything for you.