Update Addendum:
Okay I unplugged all three relays on the left, those you seem to have earmarked as:
a/c blower high speed relay
Horn relay
But the horn worked throughout the experiment. So whatever the horn relay does (alarm maybe? although my car has none) it doesn't disconnect horn.
So it seems perhaps(?) that at least one of the three relays on left have been misidentified or left unidentified.
The actual horn fuse is under the hood on drivers side by battery in box holding headlight fuses also.
RE:20 amp DRL (Canada)
I supposed this was the larger relay (silver/black) at top (read Made in Canada on it in pic) ...maybe instead there is a fuse below you mean.
I unplugged this relay but lights stayed on in daytime. It would really be great to have to turn on the lights myself at night, and shut them off saving mpg and light life... any suggestions?