Question edited for clarity.
It senses changes in air pressure.
Interior volumetric. The system checks for any variation in
the volume in the passenger compartment. The alarm is triggered if anyone breaks a window, enters the passenger compartment or moves inside the vehicle. Self-protection function The system checks for the putting out of service of its components.
The alarm is triggered if the battery, the central control or the wires of the siren are put out of service or damaged.
You can deactivate it.
Deactivation of the interior volumetric protect
Switch off the ignition.
Within ten seconds, press button A until the indicator lamp is on continuously.
Get out of the vehicle.
Lock or deadlock the vehicle using the locking button on the remote control.
The exterior protection alarm alone remains activated; the indicator lamp in button A flashes once per second.
To be effective, this deactivation must be carried out each time the ignition is switched off.
https://www.peuclub.com/pgcont-1299.html
The manual shows 'Button A'.
https://www.manualslib.com/manual/670948/Peugeot-308.html?page=89
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