CITROEN DS3 Handbook page 66

Alarm
System which protects and provides a deterrent against the theft of your vehicle. It provides two types of protection, exterior and interior, as well as a
self-protection function.
Exterior perimeter
protection
The system detects opening of the vehicle.
The alarm is triggered if anyone tries to enter
the vehicle by forcing a door, the boot or the
bonnet.
Interior volumetric
protection
The system detects any variation in the volume
in the passenger compartment.
The alarm is triggered if anyone breaks a
window or moves inside the vehicle.
If you wish to leave a pet in the vehicle or a
window partially open, deactivate the interior
volumetric protection.
Self-protection function
The system detects the putting out of service of
its components.
The alarm is triggered if anyone tries to put
the wires of the siren, the central control or the
battery out of service.
Do not make any modifications to the alarm
system, this could cause malfunctions.