Few things are happening right now. First my battery is slowly draining. It's a little over a year old. But she testing it with a multimeter, the voltage is slowly dropping. It's at 3.23 right now and will probably be at 2 within the next hour.

Not sure if this is at all related.... https://streamable.com/y21x3t

In the video I push the hazard lights then you see the airbag light blinking with it. Then I press the door lock/unlock button and something similar happens.

Also, What is this wire Harness for??

That wire harness connects the door latch module.

You need to look for parasitic draw and eliminate it.

Well I was working on my speakers yesterday and left both doors open and interior lights were still on... Is that parasitic draw?
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Google search "Parasitic Draw Testing"......I've never searched that term, but I assume it will lead you to the process of how to test for parasitic draw.

Basically what "parasitic draw"is.....it's something electrical staying on when it should (automatically) turn off.