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99 GMC Sierra - Factory Alarm Disable

Printed From: the12volt.com
Forum Name: Vehicle Wiring Information & File Requests
Forum Discription: Request Car Alarm, Car Stereo, Cruise Control, Remote Starter, Navigation, Mobile Video, and Other Vehicle Specific Wiring Info, Manuals, Tech Tips
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=5293
Printed Date: May 01, 2025 at 6:11 PM


Topic: 99 GMC Sierra - Factory Alarm Disable

Posted By: psionic
Subject: 99 GMC Sierra - Factory Alarm Disable
Date Posted: November 10, 2002 at 12:49 AM

How do I disable the factory theft-deterrant system on a 1999 GMC Sierra?  There is supposed to be a sequence of events that will stop the factory alarm from honking the horn if the doors are manually unlocked after they are locked via the remote keyless fob, but I can't find it anywhere.

I appreciate any information.. .Thanks in advance..




Replies:

Posted By: 12voltRedneck
Date Posted: November 11, 2002 at 7:23 AM

Is it factory Keyless Entry u are using. because u should be able to disarm it by the lock switch or the igntion turn on.  If it is aftermarket keyless then u should hook up the arm/disarm wires

BCM (under drivers side dash) third plug, on the right ( when looking at it) Green wire is disarm, Tan is arm.


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