At parking lot it starts alone

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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Wiring, schematic, electrical diagrams, torq settings, parts info, error/fault codes, full assembly/dissembly, service instructions and a lot moreetc are basic contents of these online books they here on this website https://big-manuals.com/

There are different alarm systems, not same for all kind of cars. You should explain, by the way, what do you mean by "resetting" an alarm.
If you mean that you have an activated alarm and you want to deactivate it some can be deactivated by turning the start key.
Then, some have a hidden button you may press
Finally, some CAN'T be deactivated, only by remote.
You only can turn off the sound removing battery cable then deactivate physically the system and to do this you should know alarm installation techniques.
To change alarm coding you need and electronic tecnician.

alarm keeps going off - Acura Forum : Acura Forums

www.acuraworld.com > ... > CL > 1st Gen CL

Jun 6, 2011 - 8 posts - ‎4 authors
Now the alarm is suddenly going off when I put the fuse back in. ... I am going to print it and keep it with my stuff in my Acura folder. ... as i connect the battery terminals and wont turn off with the remote. can you help me on this one please? ... Join Date: Sep 2012. Posts: 2. Car 1: 1998 Acura 2.3 Cl. alarm ...

1999 TL Deactivate Alarm/pull the fuse - AcuraZine Community

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Disconnect the Battery and Charge it as a STAND ALONE CHARGE (not connected to the car), You may have a bad ECU.

sounds like someone has a remote that matches your frequency. but can be a short. keys in your pocket can be pushed accidently and start it on you. happened to my brother a few times. The dealer may be able to change the code for you.

You need to reset the alarm by inserting the reset key(small plastic devise with visible contactors that should be with the keys) for a few seconds in the it's hole in the right-hand rear speaker. Open the boot look at the underside of the rear right-hand speaker to locate the hole.

I don't think that the alarm can be bypassed once installed. So you'll have to contact the aftermarket car alarm installer that put it in to try to get a new fob that will work with it, or else have it uninstalled by an alarm dealer.

I think the wires need to be traced to deactivate the alarm system, one way or another, because most alarms cut into the ignition or start wiring to prevent the vehicle from running.

unlock driver door twice consecutively to deactivate the alarm.

Open the door insert key in ignition. turn to on

Now hold down the red button which should be flashing, untill silent

this will deactivate the alarm.