If all the sensors aren't correct (ie door switches, bonnet switch, etc) then when you set the alarm it detects this and gives a different response. IIRC I think this warning signal, indicating that all is not right, includes a beep of the horn. So, I would guess that a door isn't closing properly (possibly the bonnet) or, one of your door switches is on the blink.
No harm I suppose as they are not very expensive. You could check them manually by seeing what happens to the light when you push them on and off. Remember there is a delay before they go off after switch is pushed in.
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