Wiring Avalanche tailgate 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=26591
Printed Date: July 15, 2025 at 9:08 PM
Topic: Wiring Avalanche tailgate alarm?
Posted By: yeager
Subject: Wiring Avalanche tailgate alarm?
Date Posted: February 16, 2004 at 5:07 PM
2003 chevy avalanche factory alarm. I am trying to arm my tailgate and cargo boxes which are on self grounding pin switches and have a common ground wire which I have tapped into at the dash control switch. Cargo lights come on when the tailgate or a box cover is opened. The same lights are also manually controlled with the dash switch. I am trying to get the activated ground wire at the dash switch tied into the factory alarm. Could I put it on one of the door triggers at the BCM box? Are the door trigger wires negative or positive? If this is possible and it was diode isolated, I beleive it would stop the cargo lights from coming on when the door was opened, but interior cab lights would come on when a cargo pin switch was activated. Please help if you know of a better way to wire into alarm or if my wiring into door trigger is going to fry something.
Replies:
Posted By: draasch
Date Posted: February 16, 2004 at 10:05 PM
Dome Light DARK BLUE/WHITE (+) IN DRIVERS DOOR *
* GRAY/BLACK ( ) In Boot From Rear Door Diode Isolate Connector From Doors.
is there an alarm pin switch for the hood on your truck???
how many wires are on the switches for the tail gate and rear cover???? ------------- Good Luck
David
Ace Security
813-376-9778
Tampa
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Posted By: yeager
Date Posted: February 16, 2004 at 10:29 PM
I have no hood pin switch. The two boxes and tailgate have a self grounding pin switch. The pin switches are connected into the cargo light wiring on the ground wire. The lights have two wires (+ &-). The negative wire to the lights goes to the manual switch located on the dash. The switch grounds the wire to turn on the lights. The pin switches on the tailgate and boxes mimic this. Everything is factory except I have tapped into the negative feed with the pin switches.
Posted By: draasch
Date Posted: February 16, 2004 at 10:59 PM
you will need to use a relay to covert the polarity from neg. to positive.
Convert a Negative Output to a Positive Output
If you have a switch or an alarm or keyless entry that has a negative output that you wish to use to switch a device that requires 12V+ such as a horn, dome light, parking lights, head lights, hatch release, etc., wire a relay as shown below to convert the negative output (trigger) to a positive output.
i would also use a diode so that when you open the doors it doesnt turn on the cargo light.. ------------- Good Luck
David
Ace Security
813-376-9778
Tampa
Donate to the 12volt
Posted By: auex
Date Posted: February 16, 2004 at 11:06 PM
You need to wire the negative switches into one of the door triggers. You can use the blue/black(left rear), pin A3, or the lt. GREEN/ black (right rear), pin A2, in the purple plug at the BCM. This is the only way you will be able to tie them into the factory alarm. VERIFY POLARITY with a multi-meter.
-------------
Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.
I've been sick lately, sorry I won't be on much.
Posted By: yeager
Date Posted: February 16, 2004 at 11:10 PM
Convert polarity (to positive), diode isolate and connect into the gray/black door trigger at bcm. Right? Thanks for the help.
Posted By: auex
Date Posted: February 16, 2004 at 11:14 PM
I believe it is negative, and the gray/black will only be in the driver's door. The ones that I listed are for the rear doors and they are at the BCM.
-------------
Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.
I've been sick lately, sorry I won't be on much.
Posted By: yeager
Date Posted: February 16, 2004 at 11:25 PM
thanks for all the help. I will check the blue/black(left rear), pin A3, or the lt. GREEN/ black (right rear), pin A2, in the purple plug at the BCM.
Posted By: yeager
Date Posted: February 23, 2004 at 1:47 PM
Used the rear door trigger at the bcm with diode. System works. Would like to install a relay to block the cabin lights from coming on when the tailgate or saddle bag is opened. Is there a wire thats constant +or- only when the alarm is activated? Would like to use this wire to control a relay.
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