2021 2500hd LED Low beam not working on drivers side

[Stevoe]

I work at a garage and customer complained that he has no low beams on the drivers side. He replace the headlight assembly to no avail. I discovered there is no voltage on the low beam control circuit which is supplied by the BCM. I can jump voltage over to the low beam control and they will work. We replaced BCM and programmed and the new BCM is still not suppling voltage to the low beam control circuit. Has anyone had any experience on this.

[ManyCamaroz]

This is just a WAG, as I'm new to these trucks as well, but I would think there would be a relay to them that may be faulty.

[Stevoe]

What is WAG?

[Another JR]

Wild-assed guess

Edited December 1, 2023 by Another JR