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There was a recent thread answer on this. I'm pretty sure it would take disabling some of the relays that control the headlights. If I remember correctly, you would have to break off one of the pins on the relay so that it never gets switched to the energized state.
I created the schematic below when I was trying to understand how it all worked.
The weirdest thing is how the daytime running lamps (DRL) are wired; the headlights are put into series. This is done with a relay just for that and another that controls the ground for the headlights.