This can be one of three things, either the BCM went out, the headlight control module has a short or the headlight assembly itself has gone bad. You should do a CAN scan to see which codes come up which can point us in the right direction. You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.
Here is a video to show you how:
https://youtu.be/u-4syLc-ifQ
Here is a guide to help check for power and I have included the headlight wiring diagrams so you can see how the system works, and how to replace the BCM and headlight assembly. You can get a preprogrammed BCM by searching Google or Ebay. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Tuesday, August 15th, 2023 AT 9:23 AM