Headlights are continually evolving to keep up with safety and styling. Just a few decades ago, about eight sealed beam headlight part numbers could cover 99% of the vehicles on the roads. In the 1990s, the headlight bulb became part of an assembly mounted flush in the front end. Soon came halogen and other exotic gases to improve contrast and light output. Today, many sport and luxury import nameplate vehicles utilize high-intensity discharge (HID) lighting. Here are five diagnostic tips to resolve issues with these systems. 1 Start with a scan tool: Many HID headlights have modules integrated into the ballast components. If the bulb, module or ballast is not working, it might generate a code. Some problems might be related to a loss of communication with the network used to control the lights.
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