[carsonmx114]

I could use some help on my low beam headlights. After much frustration these are the only lights not working. I noticed a flat plug on either side of the car in front of the fuel tank. These were plugged into something called a headlight vertical aim control I think. On the wiring diagram there is also a potentiometer for headlight vertical aim control. It looks like there's a motor involved with the control units, are they in the headlight assemblies or is this what's missing under my hood? Of is there a poteniometer for each light and that's what I'm missing... I only see one potentiometer on the diagram.
Thanks in advance.