Flashing SRS/ airbag light

Yesterday, my airbag light started flashing, about 1 second on, then off, and it doesn't stop while the truck is on (it's almost not perfect time intervals tho). truck was perfectly fine when i left it and now i got this annoying flashing light on my clean dash. Anyone fix this? video https://drive.google.com/file/d/1Bx4pRgIyMg2dT1gSg68Vku9lJKxejelo/view?usp=sharing

 

its flashing a pattern....like morse code
the flash intervals can be manually looked up and point to the AB system failed part

never heard of flashing unless diagn pins connected thou

my internet guess is seat belt pretensioner