My other car is a Lexus. The guys at the Lexus forum reccommends turning the headlights on and off manually if you have HID lights. The reason is so the HID bulbs have longer life. When the lights turn on, an igniter wakes up the gas in the bulb. This process actually hurts the bulb. The more this process is repeated, the lesser the life span. If it is set to auto, the lights can turn on if you drive under a viaduct or while in a dark garage before you back out to a sunny day. Are the HID bulbs on the Enclave warrantied? Or is it treated the same as maintenance like brake pads?