Door trigger sensor?

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=35660
Printed Date: May 18, 2024 at 11:11 AM

Topic: Door trigger sensor?

Posted By: spokman
Subject: Door trigger sensor?
Date Posted: July 15, 2004 at 7:11 PM

How does it work? My alarm has either a + or - input. Not sure what it is sensing? Can anyone explain how it is working?

Replies:

Posted By: profuse007
Date Posted: July 15, 2004 at 8:00 PM

what kind of car do you own?

one car might have neg others might have pos.

taken ur car, say its negative trigger(no need for the pos wire), which senses if the doors are open or not during the state of arming.

when arming, if someone open ur door for whatever reason, ur alarm goes off.

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Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).

Posted By: spokman
Date Posted: July 15, 2004 at 8:15 PM

I understand that but I don't understand what the alarm is sensing? Is a circuit being completed or is it just sensing polarity or?

Posted By: profuse007
Date Posted: July 15, 2004 at 8:38 PM

who knows, i could be either depend on the makers.

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Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).

Posted By: Javelin3o4
Date Posted: July 15, 2004 at 10:24 PM

The alarm will senses 12v, or ground.

So on a negative door trigger system, when the alarm is armed its looking for 12v comming from the door trigger, when it does and the alarm is armed if the door is opened the pin switch then looses 12v. and will show ground, setting off the alarm because the alarm is no longer getting 12v from the door trigger.

On a positive door trigger system, when the alarm is armed its looking for a ground signal comming from the door trigger, when it does and the alarm is armed if the door is opened the pin switch then will read 12v setting off the alarm because the alarm is no longer getting a ground signal from the door trigger.

Posted By: spokman
Date Posted: July 15, 2004 at 10:34 PM

Thanks everyone! Javelin that really made it clear what is happening. Appreciate the help!