’05 dakota, compustar remote start/alarm
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=109314
Printed Date: May 11, 2025 at 12:44 PM
Topic: ’05 dakota, compustar remote start/alarm
Posted By: beazlbub
Subject: ’05 dakota, compustar remote start/alarm
Date Posted: November 29, 2008 at 12:43 AM
I have a 2005 Dodge Dakota ST, and have installed a Compustar 2W900FM-AS system, the brainbox is CMU3000. I have followed the wiring information on this site along with the wiring information from the manufacturer. My problem is that after the doors are closed, my door sense goes from 12V+ to only 3V+ and causes the system to see the doors open (it is a negative sensing system). I have searched on this site and found a diagram to add a relay into the system, but if I'm reading it correctly it only gives a ground when the door is open, and it requires a 12V signal with the doors closed. I have attached the diagram that I have found, and am wondering if it is correct for my application or not. If more information is needed just let me know and I'll try to get it as fast as possible.
door trigger isolation
Replies:
Posted By: KarTuneMan
Date Posted: November 29, 2008 at 1:35 AM
Where did you find your door triggers?
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Posted By: soundnsecurity
Date Posted: November 29, 2008 at 10:39 AM
wire your relay like this:
30 = ground
85 = + door trigger you found
86 = ground
87 = - door trigger input
this will give the alarm a negative signal when the door is opened
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Posted By: soundnsecurity
Date Posted: November 29, 2008 at 10:46 AM
oh and make sure you test both doors. i forgot dodge likes to use independent door pins so the wire you found might be just for that door. if you do have independent door pins just do the same thing for the other door once you find its door pin
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Posted By: beazlbub
Date Posted: November 29, 2008 at 12:29 PM
I have connected to the wires behind the cluster, and it is a quad cab truck. The problem is that it should see a ground with a door open and +12v with the door closed, and after a door closes, after a few seconds the voltage drops to +3v, which the brain sees as a ground. I've included a poorly drawn diagram as to how I've got it hooked up.
Posted By: beazlbub
Date Posted: November 30, 2008 at 9:00 PM
Okay, I have installed the relay, and it is working like it should, but now the system will not go into "Reservation mode" for the auto start. Any suggestions would be greatly appreciated.
Posted By: jimmyray
Date Posted: December 25, 2008 at 11:45 PM
i had the same prob with my 2005 Dodge Dakota Laramie. But if you watch the blinking factory led on the dash u will notice that it will change its blink rate after about a minute or so. Only then can you arm your compustar, otherwise the factory alarm will retrigger the doors setting off the compustar alarm. Thats wht i do .. wait two mins before arming. I think it has to do with the dome light delay and the headlight conveinience feature. If anyone has a true solution to this problem .. i would like to rewire mine so i dont have to go through the whole 2 mins wait before arming. But in the mean time it has worked for me for 3 yrs now Thanks.
Posted By: chriswallace187
Date Posted: December 26, 2008 at 11:29 PM
The solution to this sort of problem is well established. Check out Directed tip 1076 for a diagram.
The door triggers need to be diode isolated from the control module(the instrument cluster in the case of this post's Dodge Dakota) as well as from each other. This eliminates false grounds from a control module altogether. ------------- C Renner's Auto Electronix
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