alarm won't go off when door is open

Where is the BCM in this Ford Explorer 1999. Can I just use the door wires that come from passsenger and drivers kick panel. Or these doors wires have to be at BCM. There is 5 door wires total, as per diagram that KartuneMan send me. I have to use 10 1amp diodes to isolate. 5 for the BCM with the no band face to the BCM,  and another five diodes comes from the brain which is the  -green wire negative (Scytek). Twisted them togther and connect to the BCM with the band toward the joint. And then use Violet + (scytek) for positve door trigger to + BLACK/ lt blue door trigger or domelight on the Ford. Or the second method is the throw in a relay and just use five diodes. The only thing I don't understand that where is the positive door trigger being connected to if I use the diagrams below. Look like the connect from the brain of the alarm is the negative trigger, and positive trigger (brain) to positive trigger(Ford) BLACK/ light blue. Help me to locate the BCM on the Ford, or the I just be able to use all the wires from pass. and drivers kick and follow the connection of this diagram below

< color=#0068cf>htt! p://www.directechs.com/techtips/pdfs/resources/security/directed_techtips/1076.pdf

Pull the light down from the headliner, and test the wires at the light. The one that changes polarity when the door is opened (from negative to pozative) is your (POS)+ door trigger