I was not able to locate that one IGN1 fuse going to headlamp rocker switches. Having the winch working through me for a loop, but the lights fixed themselves before I followed winch wire to its rocker switch... so it is still unknown to me how it was possible. I'm guessing the wiring diagram is only a guideline and not a true manufacturing document (at least not for my model)
I had 12V at the ignition switch, but not at the contact switches. I also had no reverse lights, horn, and 4x4... and all fuses were good. I followed IGN1 from the ignition switch (yellow wire) about 20" to a connector where it turned blue. After the wire turned blue there is a splice going to the horn switch, then the rest of the cable bundle went to the back. I didn't go further because it started working. It must have been a bad connection at that connector where the wire color changed from yellow to blue.
Can you tell me where the wire turns from solid blue to blue/yellow stripe? There is no fuse going to the horn, and the splice looks factory to me. Maybe the horn fuse is actually the one going to the headlight rocker switches?