Majority of Viper alarm models contain a feature called Nuisance Prevention (NPC). NPC monitors all alarm zones and, if any are triggered excessively, bypasses them until corrected. If a point of entry (trunk, hood, door) is left open following a forced entry, it is bypassed. 

It becomes active again only after being closed. Bypassed sensors automatically reset after one hour and after the vehicle is driven. 

Disarming then re-arming the alarm does not reset bypassed sensors.