When you drive through thick fog, your headlights are unable to do their job properly. It's because the water molecules in the fog cloud reflect light back at you when you turn on your headlights. Good thing you can count on your fog light. It reduces the glare produced by the fog cloud so that you can drive safely. Your Cadillac Escalade fog light is able to do this because it is angled downward toward the road. Although there is a common misconception that a fog light is a special lamp that cuts through fog, it basically is the same bulb as a headlight. It can have a regular bulb, a LED lamp, or an HID lamp. As such, it goes through the same problems as a headlight, or any other light bulb for that matter. Listed below are some common problems you might encounter or might have experienced with a fog light and how to diagnose and troubleshoot them properly:
Check if the lens is knocked out by visually inspecting the fog light assembly. The lens is not completely transparent and limits the amount of light coming from the fog light. It has cuts called fluting, which determine how light is deflected. If it is knocked out, the fog light would essentially become a spot light that has a completely clear lens or one that has no lens at all. This can be dangerous, as more light might be reflected back at you by the fog light when you are driving. The lens may also be broken, causing more light to escape from the fog light. In this case, there is no other solution but a replacement.
Tiny pits can develop on the surface of the lens, which affect the flow of light from the bulb to the road. These minor damages are caused by sand or road debris, and can cause the light coming from the fog light to come out a little weird. Consider replacing your lens. These pits and small cracks can actually turn into a bigger problem if the lens is not replaced immediately.