It is inside the factory headlamp unit. There is a screw that moves a threaded adjuster which moves the bulb carrier and reflector. This system is designed to operate only with the OEM type bulb. So if it came with halogen bulbs and you install an LED bulb the adjuster is not going to do much because the light pattern is not correct for the reflector.
Feb 5, 2018 at 6:24 PM