Well, my alarm is playing up again.
Previously I had issues with the siren. It never worked, so when I was told to check under the glove box and see if it was connected, I discovered it wasnt.
So I connected it, and it would seem my siren worked.
After a few days it didnt, it died and just wasnt making any noise - I was told the battery in the siren itself is more than likely flat, so due to me not having a clue I just disconnected it again and left it.
That was several months ago.
The other day I was changing a few fuses because my lights were out, when I went to lock the car on button it wouldnt, was just turning alarm on/off. I realised my drivers door wasnt shut properly - so I closed it and locked the car.
Now since then, whenever I lock the car, wait 5 seconds and something sets the alarm off - indicators flashing etc (siren would be going off obv. if it was connected)
So I have to wait 5 seconds or so after locking it, to push the button to turn alarm off when it starts going off.