2004 silverado easy door trigger

we just installed a security system on a 2004 chevy 1500 silverado today and I noticed that most wire diagrams show two colors at the BCM. Well for some reason this truck didnt match the tech sheets. None of the many tech sheets i used. In some of the tech sheets it mentioned that i had to go into the driver and passenger doors, so i opted to use an interface module for door locks and door trigger like i have used before on 2003's. i used the one from DEI that is supposed to do both and is specially made for this truck. Well I got the door locks to work but the door trigger didnt. Alarm would not trigger when door was opened. So I found the door trigger wire in a location not mentioned in any tech sheet i've seen.

It is gray/black (positive trigger) in a brown plug at the fuse box above the parking brake. You must remove the black cover first to access the brown plug. There is two gray/black wires, one for the dome light and the other for the two map lights in front. worked fine. This truck had the two front doors and two rear doors that will open only when the front doors are opened first. Dont know if this will work for the full four door model. We will be doing one tomorrow, i will verify. I think it should since i traced these gray/black wires all the way up to the dome lamp itself.

Has anyone done this or encountered this problem?

well because the tech sheets I have used dont match up to what they say on this 04 truck