IF 2002 is the same as 2000:
They do NOT get constant power (although that is TRUE on many older vehicles, particularly imports. I believe they stopped this practice when they added switches and clocksprings to the steering wheel).
The fuse powers the relay coil (and the horn relay contacts) with the YE/LB wire. Then, YE/LG goes to the clockspring, on to the horn switches, through ANOTHER clockspring contact to Ground (G101 just in front of the battery).
That same power from the fuse (YE/LB) is sent through the (when energized) relay contacts to the horn, which is self-grounding through its mount.
2000 2.5 MO5D 4.10 one-wheel drive DD - gave to my older son
1990 STX 87 2.9 going in.....Junked it
2000 3.0 4WD M05D 4.10 S-cab Off-Road package with 235-75-15" tires, hotrod DD, lol