Pwave is right.
I spent couple of hours last night, going over the diagrams looking for the headlights relay that doesn't exist
But just
I will post some diagram later on how I think it should be done, but basically you need to use a relay to jumper between the red and white/black wires, at the light switch.
Both are heavy gauge, so you will need a 30/40 amp relay.
The relay will be activated by the brown/yellow wire that comes from the BCM.
Since it is running all over the car, it can probebly be located at the ckick panel/ fuse box area. Same goes for the wire that comes from the light switch. It goes into the fuse box, and comes on the other side as yellow/black.
Obviusely you need to connect before the fuse.