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If it's a factory toyota alarm try putting the key in the ignition and turn the key to run for 3 seconds then off 2 seconds then run 3 seconds then off 4 times. This should reset the factory alarm and make the horn stop honking.
If it's an aftermarket alarm it will depend on the alarm type. Can you tell if it is factory?
That sounds like a toyota factory alarm. Try turning the ignition on and off as described and let me know what it does.
Does your car have a red blinking light next to the steering column?
My manual says "turn the key to run and then press the button twice".
Oh good. Alarms are a pain in the tail.
Please let me know if you need help in the future.
Let me know if you still need help with this.
Please don't forget to rate.