Door Triggers / False Alarm / Diode Wiring
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=4801
Printed Date: May 18, 2024 at 11:02 AM
Topic: Door Triggers / False Alarm / Diode Wiring
Posted By: cericthered
Subject: Door Triggers / False Alarm / Diode Wiring
Date Posted: October 24, 2002 at 10:37 PM
I am wiring up a Viper 550esp to a 2001 Mustang 3.8L coupe. I am running into the common problem of the 30 minute false alarm being set off by the GEM in the car shutting down the power to all the lights, thereby triggering the door alarm. I have diode isolated both driver and passenger trigger wires, so i don't know what is wrong? Which end does the cathode supposed to face in this situation? Anyone have a wiring diagram for this specific situation? The door trigger wires are (-). The alarm provides both a (+) and a (-) wire for the door triggers, and i know i am using the (-). Thanks for any help.
Replies:
Posted By: lalur
Date Posted: October 24, 2002 at 10:59 PM
whats up man the best thing to do is add a islation relay and u also want to cut the trunk wire and in sert a diode
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any help ask
Posted By: cericthered
Date Posted: October 25, 2002 at 12:04 AM
What is an isolation relay? I have not even hooked up the trunk wire yet, so i know that is not causing the problem.
Posted By: Velocity Motors
Date Posted: October 25, 2002 at 12:42 AM
What amperage diodes did you use for the doors ?
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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: cericthered
Date Posted: October 25, 2002 at 10:16 AM
I used the following: IN4004 , Forward Current: 1 Amp , Reverse current 30mA
Posted By: Velocity Motors
Date Posted: October 25, 2002 at 10:33 AM
Band facing the door triggers? Wire another 1 amp in parallel and this should solve your problem. ------------- Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: cericthered
Date Posted: October 25, 2002 at 10:59 AM
Yes, i put the bands facing the doors. So I should put two diodes in parallel? (vs series) Is this what is termed "double diode isolate" ? I wonder why the wiring instructions didn't tell me to double isolate each trigger wire. Am i using the right diodes?
Posted By: Velocity Motors
Date Posted: October 25, 2002 at 11:54 AM
You are using the right diodes, but sometimes the amperage is not enough and you still get trace currents going to the BCM that controls the door trigger. Try this and post your results. Fords have always beena trouble vehicle for most installers witht he GEM, PATS and other items that they seem to throw installers way.
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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: Big Dog
Date Posted: October 25, 2002 at 1:42 PM
Hey cericthered, First of all you need two diodes per door. Twist the band sides of the diodes together then CUT the pin switch wire from the door and put one diode inline with the band facing the door and connect the Green trigger input of the alarm to the black side of the second diode. Do the same for the other door and again the same for the trunk switch. There is another method using a relay but try the diodes first.  ------------- Prepare your future. It wasn't the lack of stones that killed the stone age.
Posted By: cericthered
Date Posted: October 25, 2002 at 1:44 PM
I am doing a test on one door as i type...so i'll post how it goes later on...
Posted By: cericthered
Date Posted: October 25, 2002 at 2:33 PM
Okay here are some diagrams: Right now i am using "A" (the first one) and it's not working. From what i could understand, Jeff, you are telling me to do "B", does that look right? BY THE WAY, these pics are displaying hookup for ONE door only.
Posted By: Velocity Motors
Date Posted: October 25, 2002 at 2:45 PM
yes, do "B"
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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: cericthered
Date Posted: November 08, 2002 at 9:17 PM
Okay that did it! Everything works fine!
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