The horn relay should be located on the fuse box under the dash. most of the horn relay's that I have seen are a big white fuse, if it isn't on the fuse box, check near the horn.
Have your Mazda dealer parts department print out a picture of the relays location for you. They will do this if you ask them.
I have a 1993 Mazda Protege LX and I was told that there is no relay for the horn, there is a horn switch inside your steering wheel. that might help
The relay fuse for the horn on a Mazda B2200 is typically located in the fuse box under the dashboard on the driver's side. You can identify the specific fuse for the horn by consulting the fuse box cover diagram or the owner's manual. If the horn is not functioning, check the fuse and the relay to ensure they are both in working condition.
It is important to know where the parts are within a car. The horn relay in a 1993 Mazda Protege is found in the cars fuse box.
The horn is located on the passenger side of the radiator support behind the bumper. The horn relay is located on the passenger side fenderwell. I've attached some links below for future reference.
horn circuit mazda bt 50
The 1990 Mazda 323 horn relay switch can be found on the front drivers side quarter panel. The relay switch will be on the inside of the quarter panel.
The horn is located behind the front bumper on the passenger side. The horn relay is located on the passenger side fender well. I've added some links below for additional information that may be useful to you.
where is the horn relay switch located on a 2007 ford focus
relay is located on the left side under the steering wheel. i still looking for horn. cant find it.
where is horn relay on 1995 buick roadmaster