Headlight and horn won't shut off

[mjursnic@cisco.com]

I just got 04 Mazda3 a few weeks ago. I just ran into a really strange problem. The horn used to act a little strange and stay on for a second or two when activated. Didn't think much of it, probably the horn relay sticking.

Anyway, just the other day the horn wouldn't stop after I slighlty tap it. I had to disconnect the horn. This is where it gets strange.

The headlights and dash brake light (parking brake light) will now not turn off unless I remove the horn relay OR press the horn. Yes, pressing the horn turns the headlights off. Horn honks continuosly regardless if its pressed or not.

Anyway I tried a different relay and no change. So I just removed the horn relay and everything is fine other than no horn.

Any thoughts?