My 99 Toyota Avalon horn does not make any sound.

It truly sounds as if the temp control panel has failed. Could be a contact in the temp control button. I am basing this on the fact that everything else is working correctly. You can usally find an inexpensive one through Car-Part.com or Ebay.

Hi I have a 2003 Toyota Avalon xls so, lol I do front wheel burn out how? I put water on the front right tire pull the E brake, turn off traction control by pressing the TRAC OFF button under the steering wheel panel now the TRAC OFF button is not working or showing on the dash so abs/traction contrition is on at all times how can I fix it or disable traction control with out the button?

The blower motor switch or the resistors are defective.

problem with steering wheel/column wiring harnes

There is a hidden deactivation button in the glove box. Just push it and your problem should be solved.

You could check if current runs to the horn wires when the horn switch is pressed. If ok, then the horn itself may be old. Next thing is the fuse, the grounding source, the horn-wire plugs.

See toyota technical service bulliten AC005-99.
This is a expensive repair but if you just unplug the the air inlet servo motor(behind the glove box )
the air should start to work but without fresh/recirc control.

If when button is pushed in it stays in the AC-light lights up, then you may have another problem like a leak in the system N0/low Freon in system and AC would n't work. But if the switch doesn' t stay push in when its pushed then the switch is BAd and needs to be replace and that will solve the problem. If the switch stays push in with NO AC light on then you may have a bad Ac fuse. Good luck and thanks for using Fix Ya

Probably the switch in the steering wheel, or fuse, but usually horn fuse works other things too such as cig lighter or radio. If everything else is working fine, then to troubleshoot you'll need a testlight. I would start with the wiring harness where the steering collumn plugs in and decipher which wire is the horn wire. Put the test light clip on +power, then check the wires on the collumn side one by one, pushing the horn button on each one. The horn switch is the wire that makes the light blink when you push the button. If you try all the wires and none make the light blink, then its probably a problem with the horn switch in the s. wheel. Does it have an after market steering wheel? Because aftermarket wheels often have crappy horn switches in them. Also could be a horn relay if it has one. If you listen carfully while pushing the horn, you should hear the relay faint clicking. If you hear this, then the switch is working, but the relay might not be. Follow the sound to find it if you hear it. Test all sides of the relay with your light. Should get power constant on one term, and the other two should light when the horn button is pushed. Hope this helps. Cheers.

It depends on if the relay makes a clicking sound. This will help you figure out your problem. Everything between the horn button and relay is good if it makes a solid click sound when you press the horn button. So then the problem is in the power side of the circuit. Usually the relay contacts or horn.
And then if there is no click that means the problem is on the control side. Which is the steering-column wiring or horn buttons!