Spellnj3

one yellow, one black

Spellnj3

there are two swing doors.

mountainmanjoe

This is correct. The door ajar switch 'grounds' the circuit. What Spell did would still work. Shorting the wires together accomplishes the same thing because you are simply bypassing the switch. BK goes to ground, YE/BK goes back to the BCM, and so the circuit is simply shorted to ground.

wire 1: Yellow with a black stripe
wire 2: solid black

right? I think you got the correct wires but clearly the switch isn't the problem. So you would go to the schematics and find the circuit for the side door (instead of the front door like I originally did)

Test continuity between BCM - X6 - pin 14 and ground. (see the connector drawing in my first post). You can also probe @ connector X318.

With those schematics you have enough information to isolate the door ajar problem now. Post here if you run into any trouble.

locking/unlocking problem:
Before you can troubleshoot this, you'll first need to be able to reproduce the problem in a predictable way. Is it completely random or do you think there is some pattern or trigger to it? Certain gear, speed etc. or vibration.

Spellnj3

The unlocking/locking only happens with the "right rear door ajar" alarm

mountainmanjoe

OK and you said that happens every 3-4s the entire time you're driving right? That sounds like you have some faulty wiring so you need to check it like I described. Also check the switch ground (G348) which is screwed to the B pillar.

Oops I forgot to give you the link to the drawings.
https://www.gmupfitter.com/pages/body-builder-manuals
(2013 is same as 2012)