my headlight switch is on the left off the dash, what is the switch under it?
Most likely for interior light dimming or fog lights.
it is a switch for the fog lights, since yours is an lx the switch is non functional
Zachary422 is right.
Here's a pic of the headlight/foglight switch on a GT.
Looking for a Used Mustang in your area?
CarGurus has 44,310 nationwide Mustang listings starting at $1,500.
Search Ford Mustang Questions
Ford Mustang Experts
Related Models For Sale
Used Cars For Sale