can someone explain this wire test for me

I am trying to use a factory wire from the car as an output to my aftermarkets disarm wire. It's a factory smart key keyless entry. I've found the schematic for the car and the wire that goes to the keyless system. It shows 5v at all times and drops to 0 when your hand touches the door handle on the outside of the car during unlock. What type of wire is that and how can i use that as an output? In the schematic below i'm referring to the drives door outer handle (left side) and the orange to lt blue wire. http://s13.postimage.org/ead6z7393/Door_Lock_Wiring.png

It would really help us help you if we knew what kind of vehicle you have.

2012 Acura tl

	Battery		WHITE		(+)		IGNITION SWITCH HARNESS
	Ignition 1		BLUE		(+)		IGNITION SWITCH HARNESS
	Starter 1		YELLOW		(+)		IGNITION SWITCH HARNESS
	LF Latch		GREEN		(-)		DRIVER UNDER DASH FUSEBOX
	RF Latch		LIGHT BLUE		(-)		PASSENGER UNDER DASH FUSEBOX
	LR Latch		LIGHT GREEN		(-)		DRIVER UNDER DASH FUSEBOX
	RR Latch		LIGHT GREEN		(-)		PASSENGER UNDER DASH FUSEBOX
	Trunk Trigger		WHITE		(-)		DRIVER UNDER DASH FUSEBOX
	Hood Trigger		GREEN		(-)		DRIVER UNDER DASH FUSEBOX
	Alarm Disarm		BROWN		(-)		DRIVER POWER WINDOW SWITCH
	Alarm Arm		PINK		(-)		DRIVER POWER WINDOW SWITCH
	Parking Lights		RED		(+)		DRIVER UNDER DASH FUSEBOX
	Low Crr Pk Lights		GRAY		(-)		DRIVER UNDER DASH GUSEBOX

Note for alarm disarm reads:

TEST THIS WIRE WHILE TURNING THE KEY IN THE DRIVER DOOR CYLINDER, THESE WIRES WILL ALSO CONTROL DOOR LOCKS AND WINDOWS/SUNROOF WITH EXTENDED PULSES

I'm trying to disarm the aftermarket alarm after I touch the exterior door handle (and I have my factory smart key with me.

Maybe I can just get the trigger from the factory arm and disarm wire to use as an output to the input on the aftermarket arm/disarm wire??

a wire to disarm an aftermarket alarm does not exist.there is a manual disarm procedure that involves using the key and the valet switch but there is no single wire on the alarm that will disarm the alarm. a wire that goes from 5v to 0v is usually a negative trigger. no offense to you but if you dont understand these basic concepts of trigger wires then you really shouldnt be messing with such advanced functions that need to be custom wired. bad things can happen when you dont fully understand how to test and interface these wires for an aftermarket alarm.

The issue you will face with trying to use the button is that the button itself doesn't "know" if you have the key present. The button most likely just sends a signal to the BCM (or some other electronic controller) that lets the controller know the button has been pushed. The controller will then check to see if the key is present and then decide what to do next (ie unlock the doors). When you push the button on the drivers door, with the key in hand, does it unlock all 4 doors or only the drivers door? Using the factory disarm wire won't help either as it is most likely only triggered when you put the key in the door and turn it to the unlock position. It most likely isn't pulsed when you push the button on the door.Kevin Pierson