OK so This sounds crazy and there is no way Toyota would do it on an older rig and not a newer rig. My 80 series when I started the rig the doors would automaticaly lock. So Now that I have a 100 series I cant find anywhere that says it will. Mine will not lock by themselves. I have to lock them manually. Yes I did a search first. But maybe there is a double secret code so they will lock when I start the rig.