How to Deal With Headlight Assembly Failure Errors

After installing the headlight assembly, you are receiving an error such as, "Adaptive front lighting system failure" on your dashboard, here are a few reasons why such errors may appear:

If your vehicle is equipped with an adaptive headlight system, a scan tool is usually required to adjust the headlights to their base position so that the computer can adjust them during vehicle operation. There is a computer that controls how each headlight moves during cornering maneuvers and over dips in the road. This computer is usually located somewhere on the headlamp assembly and often on the bottom of each headlamp. This computer does not come with most headlight assemblies, so it must be swapped over from the original headlight to the new one. If it is replaced with a new one it will most likely need to be programmed. If the original headlight was busted, or had any condensation present, it is possible that the computer may have been damaged from water intrusion. This is due to the computer being located at the bottom of the headlight where water or moisture is prone to collect.

Is the headlight coming on?

If the headlight is coming on this indicates that the ballast, igniter, and bulb are working. If the lamp is not coming on, there could be an issue with one of these components. These can be swapped between a working and non working headlight in order to isolate the faulty component. HID headlight diagnosis and repair should only be performed by a qualified technician. Never work on HID headlight systems when they are powered on or when the key is in the ON position. HID lights operate at high voltages and you can be electrocuted. Most vehicles with adaptive lighting systems perform a system check each time the headlight is powered on. During the check the lamps may move up and down or side to side for the computer to verify that the system is working properly. If a fault is detected the adaptive headlight system will be disabled and default to normal operation. If the headlight is coming on, but does not move during start up or driving maneuvers, there could be an issue with the headlight range control module. The exact problem could be due to any one or more issues in the headlight range control system. It is difficult to determine the issue without knowing the specific fault code data that is causing the warning message. A scan tool capable of retrieving faults is a must when it comes to diagnosing adaptive headlight range faults.


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