What it took to fix mine:
Reconnect VSS
Disconnect wire from horn button.
The horn was stuck on, but the horns themselves were dead. Only way I found this was when I removed the horn pad to fix another issue and heard the relay click. Incidentally, this stopped the parasitic drain that would kill my battery in 3-4 days.
Check connections at the clockspring, speed amplifier and servo, brake switch, and fuses.