2. Door open lets you unlock all doors or just a single door when you press unlock once on the key fob. Auto close locks the doors when you exceed a certain speed.Auto open unlocks all doors when you remove the key from the ignition. If you're in a car crash, the doors should unlock automatically.Click to expand...uto close locks the doors when you exceed a certain speed. Auto open unlocks all doors when you remove the key from the ignition. If you're in a car crash, the doors should unlock automatically.