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Normally you hit the lock button twice to make the horn beep, but I think your car does a double beep but it not the horn if it dont beep anymore you could have it fixed but would it be worth it?
It might be the alarm system; or your car is going haywire.
Does your horn actually work?? OR you might have dis-engaged the horn from working from your remote.....see your manual on how to engage it!
there is a setting on the alarm system that allows you to defeat or quiet the alarm /panic horn under the hood the alarm box is located under the drivers side seat. I get home at 3am from work and was waking up my neighbors when locking my car. The Subaru dealer will be able to activate the horn for you and it should be free because he took 10 seconds to silence mine.
The horn button contacts on the steering wheel are dirty.
If You Just Press The Button Once It (horn) Does Not Sound.. Try Pressing Button Twice.... To Test Your Car Alarm Roll Down Your Driver Side Window,Get Out And Set The Alarm; Then Reach In And Open Door, Alarm Should Sound... If Not Have It Serviced........ Hope This Helps....
Are you sure you're setting the alarm and not accidentally hitting the panic button?
A good way to fine the horn relay if you dont have a manual is to pull the wire on the horn then have somewon press the horn button .... beep beep beep you will hear a clicking sound which will help you locate the relay
it makes a horn noise when you are in a vehicle.
Horn. Hooter. Beep.
A bull!
A big long loudHONK!