Originally Posted by accordvtec77

I think it has to do with the actual headlight aiming system. My ecodes have electrical motors built into the vertical aiming screws. On a car with factory HID systems, the leveling is done automatically, to prevent the driver from blinding oncoming traffic when there is more load on the rear of the car than the front (the rear sags). If my car was european spec, or japanese spec, that switch would be there, and so would the wiring to the headlights. On a car with halogen lights, it's hardly worth the money to have a computer automatically aim them, so that's what that switch is for, to aim them DOWN, as needed.