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I can't seem to make the alarm activate?

I just bought a new Ford Ka, fitted with a sigma remote ultrasonic alarm. When I get out, I press the button, the doors lock and the alarm beeps. But then there are a series of continuous beeps before the alarm actually goes off. I then have to press the button again which opens the doors. I can lock the doors with the key, but I'd like to set the alarm and i don't have a manual to say if I'm doing something wrong.
Denise Jones, November 2007
Ihave same problem on motor home. It continues to beep after locking. This means there is a door open or as I think in my case a fault on one of the door sensors. There are 7 doors/sensors on mine and can't determine which has the issue. Anybody know how to resolve this?

Martin, September 2009
link Click here to see other fixes for Sigma Sigma remote ultrasonic alarm.