Horn is good will not blow from sterring wheel

Make sure all your connections are good. If the horn relay clicks when you push the horn, you're getting power to it but you might not be getting power out. Get a test light and make sure you have juice at the relay going to the horn and at the horn connections.

Oh, the HORN? They probably won't issue you an inspection sticker if the horn isn't working correctly, but...
...you can locate the horn (find where the sound is coming out) under the hood. It should have one wire connecting to it with a small plug. If you unplug that wire, it'll stop making noise.

You may be able to fix the problem by replacing the steering wheel center pad, but it MAY have an airbag in it. If it does, there's a risk that you'll trigger the airbag, so please have someone HANDY do that job for you.

Check the steering wheel horn connection and wiring.

your horn button and wiring is ground for the coil side of horn relay, usually. My guess is problem with horn wiring in steering column, maybe a clock-spring issue? I saw two different years listed for your vehicle? It may not make any difference?

Airbag wont go off. It doesnt discharge by tampering, its electrical..... Dont mess with any yellow wires tho. Im pretty sure airbag wires are double yellow. Or wrapped in yellow tape/casing.

check the power to the horn with a test light.have someone push the horn button and look for power at horn.next listen for a click sound it will come from the horn relay if it is working.find the horn and apply power to the horn and it should honk.if not replace horn.other wise there is a contact in the steering wheel that it touches .that ring or contact might be at fault.or relay if no click heard.

i would say steering column

I wish others had responded to your 8Toyota pickup horn problem as I have exactly the same scenario. I am trying to find an accurate wiring diagram.

May be bad horn. Get a 12 volt test light or multi-meter and attach to the horn wire at the horn. Have a helper press the horn. If you have 12 volts when it is pressed, horn itself is bad. Otherwise, may be bad horn relay. Horn cover should pull off.

Very possibly the horn relay. This is located in the left junction block ( fuse panel) on the left side of dash. Open driver door and you will see a panel cover on the end of dash. On the cover it should list the position of the relay which I believe is on the right of fuse panel. If you try the horn and it sticks on again, try tapping the relay, if stops then that is the problem.