You can try to reset the system by turning the key to the "ON" position and pushing the button eight (8) times.
Might be more/less than 8, I don't remember, but the horn will honk and the button light flashes if done correctly.
I think there are other settings you can change by doing that, but I can't remember.

 

That's not your horn, its the tweeter.. the RS3000 security system

This will help you:
http://www.parksoffroad.com/tacomamods/alarminfo/alarminfo.htm

 

I couldn't find anything in that link about putting the alarm back to default settings. I tried disconnecting the battery... and it did no good.

I asked a guy at the dealership about it, and he wanted to charge me for a diagnostic. Douchebag. I've called them several years ago when I first couldn't figure out something with the alarm and the guy helped me over the phone. I guess it all depends who you get. Maybe I'll call another dealership tomorrow, and hopefully get someone with a clue.

 

Sounds like you have an aftermarket alarm? With a special "loud" horn when activated?

Because during lock/unlock, the OEM Fujitsu-Ten alarm chirps and/or flashes the turn signals. The Gen5 chirp is even quieter.

 

I believe the original owner purchased it already with the alarm. I don't know if it's an OEM alarm or one that may have been put in at the port... just like the electronic rear view mirror and alloy wheels.

However, it acts just like my dad's OEM alarm in his '96 Tundra. When locked, it chirps once, all the lights flash once except reverse and the LED brake light. The headlights also turn on for maybe 5, 6, or 7 seconds. When unlocked, it chirps twice, I believe those same lights flash twice, and the headlights turn on for the same duration. Sounds like OEM to me.

The horn noise it's making now is not normal. I don't know why it's doing it... and I'd like to make it stop. :thumbsup:

 

Bump.

 

Problem solved.

I found this booklet hidden inside of a planner in my glove box.
The procedure on page eight disabled the horn noise. Now it's back to the chirps only as it was.

 

horn makes sound

HI there
I've got the same problem with my Toyota Camry 2010. I dont know what I 've done but the horn makes a terrible sound while locking/unlocking. I was going to fix this problem out by following instruction left before but it didnt work. Is there anyone who can help me?
Thanks

 

i just came to the dealer and the problem was solved , here the right answer,

to disable the horn, open the driver door, turn the key on and then off, Behind the alarm light unit under the dash, above the parking brake there is a button click this button 3 time and no more horn, this's working in my car toyota camry 2014.5 thanks

 

Finally one of these that works. Thank you!!!
I love Toyotas but the dealers are shysters. They will charge you to do something like this. I just bought a 2012 used Toyota Camry SE and it only came with one key and when I called to ask how much it would be for a second they said $225 for the key and $75 to program it. WTF!

 

I just bought a 2012 used Toyota Camry SE and it only came with one key and when I called to ask how much it would be for a second they said $225 for the key and $75 to program it. WTF!

Lucky you didn't buy a Nissan. With the keyless system, losing the "key" (fob, if you will) will cost you minimum $500. And you must get the car to the dealer, which usually means a tow. The reason is fair clear, there is the cost of the key, the cost of the labor to program, and the fact that the public wanted better security. That same public, however, doesn't really want to PAY for the increased security. Me, I find security in a three speed column shift, like my truck. Though I cannot take it anywhere for service, as no one can drive it.

P.S. You should call around. Each and every dealer is an independant business, and is allowed to charge whatever they wish for parts and services. I have been quoted between $50 and $0 for a code-cut key. The $0 dealer still gets my (rare) business.