After locking, 4 blinkers flash

[anip81]

Hello guys!! I have a passat b8 2015 2.0 tdi and out of nowhere, when I close the car, after 2 minutes the 4 blinkers flash and then every 30 seconds. Does anyone know what's going on? Thank you!!

[Crasher]

The alarm is going off but the siren is faulty and prolly the reason the alarm goes off, start with code read.