Hi, I am putting in a new turn signal socket in my Accord I recently bought. I opened the panel in the wheel well to access the front right headlight, and found two cables hanging down and not in use. I know the top oval-shaped white and gray socket is the turn signal, but not sure what the bottom black one with brass connectors is. Headlight is already connected working, this is a third cable. Any ideas of what this is user for? Thanks for any help