Is this an alarm?

[EmeraldRegice]

Completely randomly in frequency of times it happens, hot or cold engine, engine on or off, for 10 minutes or 5 seconds. It goes WEEEE-OOO WEEEEE-OOO WEEEEE-OOOOO ZRRRRT ZRRRRT BUZZBLIP BUZZBLIP WEEEEE-OOOO WEEEE-OOOO.

I have a Viper 550 alarm system on the vehicle and have researched, but I cannot see any fuses that I need to pull, or any lights/sensors that would cause it to go off. (Dome light, door latch sensor) It is coming from the engine bay, middle to bottom, literally right in front of the driver side door. It's somewhere in that corner. Is it a gauge alarm or the security sensor? Key fob has failed to turn sound off.

Opening and closing the the passenger side door and locking it got it to turn off, but it happened again 2 times after that. Once for like 2 minutes, the second time for like 5 seconds, 3 minutes apart, then went at least 6 minutes without going off and did not stay to see if it would happen again.

What does it mean if it is happening when the engine is off?