Citroen C3 / C5 Aircross Forums

Hi.
I have a citroen c5 aircross & recently it was broken into. They smashed the glass in back window, & i was told the alarm didnt go off until a neighbour who went to the car opened the door. I know you can set alarm for when someone in the car, and for when car empty, but after losing 15 people within 2 years, i have totally forgot how or where to change it. I think it must be on the setting for when a person or dog in car, but i DESPERATELY need to change it. PLEASE can anyone help?

The following are from the online handbook for the C5 Aircross.

My experience which agrees with the instruction text is that the interior alarm resets each time the ignition is switched on. To stop the alarm sounding as a result of interior movement, or an external breeze when sunroof is left open requires the alarm button to be held down until the indicator light shows. I think there is a fault on this vehicle which needs further investigation.