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I unlock my car and the horn goes off and the car will not start

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You will have to deactivate the security system first because the security is blocking the ignition or cutting the supply of fuel or the electrical system of the car. There is an error in the security settings of the car.

I will advice you reprogram the cars security settings to be able to use the car properly.

Posted on Dec 31, 2010


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Posted on Jan 02, 2017


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1999 Pontiac grand am horn goes off by itself and locks are locking and unlocking by themselves

Something going on with bcm. Note the diagram for the horn, one of the ground wires for control side of horn relay, goes to bcm. Probably part of security system. The other ground wire goes to horn button.
The bcm also has control over door locks. I can't diagnose your bcm from here.


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Hello,same as Matt,first my horn didn't work,is it unplugged,then I plug the horn,does not function .unlocks remotely and then the alarm begins to function!unplug quickly..I am French.THANK YOU

posting to USA Forum with a French car.
ok, its a CRD diesel, common rail diesel. we have no books on it here, nor car. my guess near same car as our Liberty
does car drive ok? engine run ok, and all things on car work ok but your listed items?
So the alarm is failing.
So the doors unlock ok, with the key fob, but then the alarm goes off. Id say, it needs help. get car serviced, or at least scanned.
if both key fobs fail, (do you have both, if no OOPS) get it serviced.
so does engine start and run, after unplugging horn.
does it?
if not does it crank over,(start spin over engine>?"
if no , then battery is dead.

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It is telling me to lock the doors with the key, this will arm the system, then you should be able to unlock the doors after about 3 seconds and this should disarm the system. Also, if it doesn''t try unlocking the passenger side door or the back glass with the key. Let me know you must wait at least 3 seconds before unlocking back glass or passenger door to disarm system once one door is unlocked without setting off alarm it is disabled. hope this helps

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1 Answer

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1 Answer

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on my car its on purpose , i had to reprogram it . to off
or the alarm messing up.
looks like yours is.
the FSM shows how to find which door sensor (etc) is messing up.
there are some tests. to do.

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1 Answer

My car battery got dead so I bought new battery and tried to replace the old one. As soon as I reconnected the terminals of the new battery the car started making panic horn noise. Its horn alarm goes on...

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1 Answer

Horn goes off by itself

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1 Answer

My car horn goes off when i open or close my doors

close the doors, lock the car, unlock the TRUNK!

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