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99 gmc denali alarm

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=40650
Printed Date: July 25, 2025 at 9:50 AM


Topic: 99 gmc denali alarm

Posted By: midasguy
Subject: 99 gmc denali alarm
Date Posted: October 10, 2004 at 9:01 PM

I'm having an aftermarket alarm installed in my 99 denali and the installer can't figure out how to by-pass the factory alarm is there anyone who can help ?

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Midasguy



Replies:

Posted By: mo12v
Date Posted: October 11, 2004 at 8:52 AM

This is what I have:

FACTORY DISARMTAN (-)at KEYLESS ENTRY to the RIGHT of STEERING COLUMN


I beleive the Door Key Switch also has a Dis-Arm wire

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MO

Don't Learn from Others Mistakes
You Might Be the One That Knows.



Posted By: sparkie
Date Posted: October 11, 2004 at 7:37 PM
Under the top front section of the center console is the BCM. You must use a relay activated by the unlock wire of the new alarm (diode isolated from the unlock circuit in the truck) to open the pink ignition wire into the BCM and feed 12 volts + into the BCM. Terminal 85 of the relay to ground; terminal 86 to the alarm's 12 volt + lock output; terminal 87 to 12 volt + fused battery; terminal 87a to the car side of the cut pink wire; terminal 30 to the BCM side of the cut pink wire. Pulsing the BCM's ignition input disarms the factory alarm. For remote starter applications, the alarm will disarm during start. It is also very important not to use the relay wirng above the gas pedal for lock/unlock. If you do, say goodbye to your BCM. Use the light blue (+ lock) and white ( + unlock) wires in the driver's kick panel.

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sparky


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