The horn was intermittant over a two week period, then it stopped working at all. is it the horn botton, relay, or horn?
Someone would need to test the relay and the circuits it controls.
The horn pad grounds the relay to make the horn blow.
SOURCE: how to remove 2008 toyota yaris rear bumper
Go to this site. http://www.yarisworld.com/forums/showthread.php?t=33767
Further down you will see a diagram of the bumper removal.
remove the two bolts under the hatch, the four plugs along the bottom edge, and the plate light. Don't forget the red circle clip or bolt on the diagram. Then you just pull it off.
SOURCE: 1987 toyota 4 x 4 horn stopped working. New horn
there should be a relay switch in the main fuse box under the hood
SOURCE: i depress my horn on my 2008 yaris and it stays on
Hello. Welcome to FixYa. Please allow us to help...
What you probably have is a bad "spiral cable", or better known as the "clockspring". This is a cable that winds and unwinds as the steering wheel is turned. This cable allows power to be transmitted to the air bag, to deploy it, in the event of a collision. Since the horn button is in front of the air-bag, the circuit that allows the horn to activate is also part of this cable device.
We would suggest having it properly checked by a professional who is very familiar with this device, and, if it is found to be bad, replaced. Non-professional diagnosis and poking about with the spiral cable could lead to an air bag that will not deploy.
Thanks for using FixYa for assistance today.
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