disabling factory alarm 2001 chevy

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=20859
Printed Date: July 14, 2025 at 9:46 AM

Topic: disabling factory alarm 2001 chevy

Posted By: revmatt99
Subject: disabling factory alarm 2001 chevy
Date Posted: November 01, 2003 at 5:26 PM

Hi, im still a newbie, here's my question. Do i need to disable the factory alarm if i am installing an aftermarket alarm? If so do i simply cut factory alarm disable wire? thanks in advance i appreciate all the insight. posted_image

Replies:

Posted By: JWorm
Date Posted: November 01, 2003 at 5:31 PM

Will people ever learn.....

Year, make and model of car?

Posted By: Justaguy
Date Posted: November 01, 2003 at 6:47 PM

Hey guy, ya u just have to arm and disarm the factory alarm with the aftermarket alarm, unless someone knows how to disable the factory alarm, cuz i've never done that before. Most aftermarket alarms have arm and disam wires on them now, and if not just put a relay in to arm it(convert the lock pulse to negative with a relay and hook it to tan at the bcm).Of course disarm is next to it ...lt. green.

Posted By: revmatt99
Date Posted: November 02, 2003 at 6:34 AM

it is a 2001 chevy silverado 1500? any ideas? thanks

Posted By: JWorm
Date Posted: November 02, 2003 at 9:46 AM

There is a light green wire at the BCM wire that you hook the disarm wire on the alarm to. To arm the factory alarm, you either have to lock the truck with a door open, or send ground to the drivers door pin when you lock the truck.

Posted By: mecpcert_1
Date Posted: November 02, 2003 at 10:12 AM

hooking up the alarm disarm wire for remote start is one thing. you should also hook up the unlock wire from aftermarket alarm to the factroy disarm wire, so that the factory alarm does not go off when you unlock the truck. dont forget to diode isolate the wires.

Posted By: JWorm
Date Posted: November 02, 2003 at 2:19 PM

The disarm wire will still pulse a fraction of a second before the unit pulses the unlock wire. No need to hook the unlock wire from the alarm to the disarm wire of the truck if the alarm has a dedicated disarm wire. Of course we don't know if it does, because yet another person didn't provide us with what alarm model he has.

Posted By: mecpcert_1
Date Posted: November 03, 2003 at 1:23 AM

i guess it depends on what you're installing, huh? posted_image

don't know why that would make a difference. anyways....good luck on your installation!