240sx door triggers, positive or negative

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=5631
Printed Date: July 14, 2025 at 9:26 AM

Topic: 240sx door triggers, positive or negative

Posted By: sammyworth
Subject: 240sx door triggers, positive or negative
Date Posted: November 19, 2002 at 5:20 AM

Im going to install an alarm in my 90' 240sx SE.
My alarm manufacturer is asking whether I have a "positive" or "negative" door switch trigger input (the wire to the door pin switch which supplies the on/off power to my dome light when door is open). How do I find out? Is this info in the car manual? We can't find it in the Chilton.

Any help would be greatly appreciated. Thanks!

Replies:

Posted By: skerr
Date Posted: November 19, 2002 at 6:03 AM

Test each wire with a DMM, for example stick the positive lead to 12v, then test the dome light wires with the negative lead and see if the meter registers 12v when the door is open & 0v when the door is closed. If 12v is present with the door open then you have negative trigger. Switch the leads and test again for positive.

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Shawn

Posted By: Velocity Motors
Date Posted: November 19, 2002 at 9:20 AM

DOOR TRIGGER----------RED / white-------------| ( - ) trigger |-----------found at the courtesy light

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Posted By: sammyworth
Date Posted: November 20, 2002 at 6:34 AM

hey, thanks alot for the info gentl;eman, i will keep you all posted,

seee-yaaa

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