How do you test an OEM disarm output wire

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=68075
Printed Date: July 07, 2025 at 11:08 AM

Topic: How do you test an OEM disarm output wire

Posted By: tbird2340
Subject: How do you test an OEM disarm output wire
Date Posted: December 10, 2005 at 11:13 AM

I am doing a remote starter install on a 2000 Ford Explorer. It says that the OEM DISARM OUTPUT wire is Dark Green / Purple. I found this wire in the kick panel but I like to test ALL wires before connecting them permanently. How do I test this wire and what should it read?

Thanks!

Replies:

Posted By: JWorm
Date Posted: December 10, 2005 at 11:35 AM

It will read Ground (0 Volts) when you turn the key to unlock in the drivers door. It will probably rest at +12v.

Posted By: infinkc
Date Posted: December 10, 2005 at 11:35 AM

i usually splice into the wire and see what reading if any you get when you hook up a DMM and disarm the car with the factory remotes, other way i jumper the wire to ground or 12v whatever the disarm wire wants and try and set the alarm off

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There are 10 types of people in the world, ones that understand binary and ones that dont.

Posted By: tbird2340
Date Posted: December 10, 2005 at 11:47 AM

With the ground probe of the DMM grounded and the red probe attached to this wire I get nothing. No reading and no change when I lock/unlock doors with factory remotes..

I also tried running red probe to 12v constant and then black probe attached to the wire and I get nothing at rest or lock/unlock.

So do I definately have the wrong wire?

Posted By: JWorm
Date Posted: December 10, 2005 at 11:56 AM

Either wrong wire, or there is no factory alarm.

Open door, hit lock on dor switch, close door. THEFT in instrument cluster should go solid for about 15-25 seconds and then start blinking every few seconds. If it doesn't, you don't have a factory alarm so there won't be a disarm wire.

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