Hi,
The headlamps are controlled by a printed circuit board in the totally integrated power module (TIPM). Because the module has so many wires coming from it, the pins in the connectors are very small and are known to break, corrode, or simply push in and lose connection.
Based on your description, I suspect this is where the issue is coming from. If you look at pics 1 and 2 below, I included the wiring schematic for the headlamps. When you check the voltage on the white wire with the dark blue tracer and then the white wire with the light green tracer, do you get 12v?
If not, the TIPM is part of the under-hood fuse box. Disconnect the battery and remove the box so you can access the connectors under it. In connector 3, locate pins 3 and 10. Inspect the pins for damage, corrosion, or anything that would limit the amount of power that can be transmitted.
If everything appears good, check the voltage at those pins. If it is low there as well, chances are the TIPM needs to be replaced.
Let me know what you find.
Joe
See pics below.
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Monday, July 11th, 2022 AT 10:06 PM