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diode isolation and cavalier door trigger

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=117402
Printed Date: May 19, 2024 at 6:40 AM


Topic: diode isolation and cavalier door trigger

Posted By: superchargedws6
Subject: diode isolation and cavalier door trigger
Date Posted: November 01, 2009 at 6:21 PM

I've got a 4dr 2001 Cavalier I'm putting an alarm in.  For the door pins, I see they are separate.  GREEN/ black wire for driver's door only, Lt. Blue for the other 3 doors.  The install guide says to tap both, diode isolate each and take to -ve door trigger input on alarm.  The door pins are 12v when closed and 0v when open.  If I put a diode on each of the two door pin wires, with the annode facing the door pin wire and the cathode facing the alarm input wire, the only way I will ever have 0V on the cathode side is if both inputs are at 0V.  This only happens when BOTH doors are open.  If only one door is open, the alarm input stays at 12v, as the wire from the door that is closed is at 12v and continues to pull up the alarm input to 12v.  How do you keep the two doop in switch wires isolated, yet allow either one to pull the alarm input down to 0V? 




Replies:

Posted By: Mike M2
Date Posted: November 01, 2009 at 8:26 PM
You have the diodes backwards. The cathode should be towards the door pins(side with stripe).

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Mike M2
Tech Manager
CS Dealer Services


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