Where is the HID ballast located and how do I replace it?

It looks like the headlamp HID ballast is located directly under the headlamp housing or lens. Here is further information and check out the images below:

HID headlamps, a ballast is located within each headlamp assembly.

Ballast

On vehicles equipped with HID headlamps, there is a ballast located within each headlamp assembly. They are provided power at all times from the BJB. The ballasts provide high voltage to the HID bulbs when voltage from the BCM (low beam outputs) is detected. Check out the images (below). Please let us know if you need anything else to get the problem fixed.

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