Component Description: Ballast
WARNING: This page is about a different car, the 2018 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.
A ballast is mounted to each High Intensity Discharge (HID) headlamp assembly. The BJB provides voltage to the ballasts. The ballasts provide high voltage to the High Intensity Discharge (HID) bulbs when voltage from the BCM (low beam outputs) is detected.