What does "Full Guard" mean in a 2005 Volvo V70?

This dashboard message refers to the level of security being offered by the car’s factory alarm system. Generally, you will see this message if you’ve somehow turned off the car’s interior motion sensors (that detects a break-in to the car). At this point, the car is set to Limited Guard mode. When you next start the car, the system should default back to the sensors turned on, and the car will offer the Full Guard message to let you know this has happened.

If the message was Full Alarm (rather than Full Guard) there’d probably be less confusion, but in this case the translation to English from Swedish seems a bit off.