[HUMTECH]

Well after re-reading parts of this post the drls wont be the cause of your prblem. If they come on as soon as you start the truck it must be an ambient light sensor problem. The bcm is thinking its dark out therefore turns on the auto headlights. Best guess would be sensor problem without being able toactually check scan data in person. I would check to make sure the sensor is properly seated in the dash and that it is plugged in