Alarm false triggering?
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=17642
Printed Date: May 14, 2024 at 3:08 AM
Topic: Alarm false triggering?
Posted By: underground
Subject: Alarm false triggering?
Date Posted: August 15, 2003 at 4:19 PM
I installed a Prestige alarm on a 2003 Mustang GT yesterday. For some reason the alarm stays armed about 25 minutes and then it goes off. What could cause this to happen? I wired it up right but do know what could cause this. Thanksw in advance!
Replies:
Posted By: xetmes
Date Posted: August 15, 2003 at 4:36 PM
im not sure if it effects that car but i would assume it is the ford GEM powering down, you have to isolate the door trigger from the GEM with diodes. What zone does the alarm say was violated the doors? you have to cut the door trigger wires and put a diode inline to block the drop the GEM causes when it powers down from inactivity.
Posted By: underground
Date Posted: August 15, 2003 at 4:57 PM
I have two diodes in line now so both doors can trigger when either door is opened. Could it be the Constant power wire off the ignition harness? Should I run a constant right off the bettery for this?
Posted By: xetmes
Date Posted: August 15, 2003 at 5:23 PM
i think the power is fine, what im saying about the door triggers is that the GEM powers down and triggers the alarm into thinking the door was open, you have to cut each door wire and place a diode inline cathode (striped side) facing the door, then hook your other diode that you have inplace on the door side of the diode, this keeps the GEM from interfering with the door trigger, but keeps the factory systems working. you have to do this on both doors. Again im not too sure if it effects that model and year but someone will be on soon that does.  What is the violation zone? does it tell?
Posted By: draasch
Date Posted: August 15, 2003 at 6:11 PM
Dome Light YEL/BLK(DR) GY/RD(PS) AT GEM MODULE * SEE TECH NOTES **
* Generic Electronic Module Is Located Behind Driver Dash Above Brake Pedal.
**Dome Light:Ford's G.E.M. Will Drop A Low Signal Across The Dome Light And In Most Cases Cause A False Trigger. To Eliminate This Cut the Door Pin Trigger Wires At The G.E.M. And Insert A One-Amp Diode With Band Side Facing Doors.Make Your Isolated Connection On The Door Pin Side. The GEM (Generic Electronic Module) Is Behind The Dash Above The Brake Pedal.
------------- Good Luck
David
Ace Security
813-376-9778
Tampa
Donate to the 12volt
Posted By: brianh
Date Posted: August 15, 2003 at 6:43 PM
You can also use a relay to isolate the door trigger wire from false triggering. Pin 85 to the trigger(+ or - Pin 86 to the oppisite of pin 86 polarity. . Pin 87 to (+ or -) and then pin 30 to the alarm cpu. Have used this in the past and it works great.
Brian
owner/installer
Sight & Sound
Car Stereo
Posted By: underground
Date Posted: August 15, 2003 at 10:30 PM
I fixed the alarm by installing two 1 amp diodes from the GEM to the switch and putting them inline. Found all the info I needed on Jeff's site and this forum. You guys are the best! Thanks for the help!
Posted By: Velocity Motors
Date Posted: August 15, 2003 at 10:39 PM
Your Welcome  ------------- Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: Duston
Date Posted: August 16, 2003 at 8:41 AM
hi i have a question , underground how did you connect each wire when you cut them? I tried this on a 2000 sunfire it worked for a little but then it started doing it again.. I cut the drivers side wire and connected the diode to the door wire and then used the other end to connect the alarm neg trigger, another wire off the same end the alarm wire is, to the passenger side wire again the wire that is cut on the passenger i connected to the top of the diode with the wire going away from the door, and then the other side that is going into the door.. ------------- Factory security systems suck!
Posted By: Velocity Motors
Date Posted: August 16, 2003 at 10:04 AM
Use diagram one and use the relay to isolate the trigger wires. ------------- Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
|