Find the make and model of the alarm.
You can download manuals fromthe manufacturer on the internet,
its usually a driver door open and bonnet open system to access the menu on alarms anyhow.
Look for the main box which will usually be found unter the dash somewhere, tucked up inside or somewhere unsuspecting if done well, I mean the keyfob sometimes gives it away on make, just its model dependant sometimes.
DONT cut the wires to the siren, or there really is no point of having an alarm at all, it will stop people stealing it with the immobiliser but when noone hears them robbing you blind of your headunit and car possesions thats when its regrettable!
Volume is adjustable on sounders etc as mentioned above
Hope this helps mate
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