On power from the Headlamp switch is sent to the multi-function switch (aka turn sig switch). The same wire from the headlamp switch is used for high or low and thats decided by the multi-function switch. The low beam circuit leaving the multi-function switch splits and goes into the fuse box under the hood where both headlamps have their own fuse.
I hope I have enough detail for you. The way I see it is the only thing that seems related to both headlamps being inop in low beam only is the multi-function switch. With the exception of a possible wiring problem between the switch and a splice before the under-hood fuse box. One more thing I would check that can be easily overlooked. Unplug multi-function switch and look into the connector ends, make sure the locking tabs for the wiring pins are there and the wires are pushing out of the connector. If so you can use your own judgement on keeping the pins in the connector shell but those connector shells can be bought from the dealer or most auto parts stores.
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