2000 ford f150 false alarm problem
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=117201
Printed Date: April 29, 2024 at 11:27 AM
Topic: 2000 ford f150 false alarm problem
Posted By: start25
Subject: 2000 ford f150 false alarm problem
Date Posted: October 24, 2009 at 12:01 AM
I installed Autopage RS900 on 2000 Ford F150, and customer reported false alarm going off like every 40 min and it shows on remote that door trigger has been triggered. So I totally disconnected the door trigger wire, still same problem alarm going off every 40 min. and sowing on the remote door trigger triggered. So I totally changed the brain (these are brand new systems from AutoPage), still the same problem. Anybody had this problem before? I have no idea what’s going on with this truck. I installed a bunch of alarms before and never had this problem... Please help
Replies:
Posted By: wooddogg
Date Posted: October 24, 2009 at 3:46 AM
where are u making connection? the easiet way to monitor the doors is at the dome light many times thats the only location i use to make things faster,,,,,,,,,,,good luck
Posted By: ajstetler
Date Posted: October 24, 2009 at 11:00 AM
Is this a base model F-150 or does it have power locks, windows, etc? Are you making your door trigger connections at the dome light?
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Big Al
Posted By: start25
Date Posted: October 24, 2009 at 4:11 PM
I tryed everything door triggers and doom light finally disconnected the trigger wire still alarm goes off every 40 min. changed the brain to brand new one still goes off...
Posted By: syl20rochon
Date Posted: October 24, 2009 at 6:12 PM
Did you use the BLACK/ blue (+) for door trigger? we have to remember that some body computers fall into sleep mode...If it's the case, I would use a relay to isolate the modules door input from the vehicule or simply a diode tapping on the door switch side...but you said that you've disconected the door triggers and you have the same problem? right? Then you might have a problem with the shock sensor...try disconnecting it and see what happens.
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Sylvain Rochon
MECP security specialist
Tech support for remote starters
26 Years of experience counts
I'm here to help.
Posted By: start25
Date Posted: October 24, 2009 at 6:58 PM
I don't think its the shock sensor because it would say on the remote that the shock sensor has been triggered but it shows that door trigger has been triggered and shows an icon on the remote like the door opened...
Posted By: syl20rochon
Date Posted: October 24, 2009 at 7:03 PM
Then..you must isolate the doors from the body computer and tap your door input wire on the switch side, the computer is sending signals to monitor the truck after it has been resting for a while and the alarm picks it up. I would try a relay before hand and if it does it again, I would go to each door switch, install a diode on the line and tap my wire on the switch side.
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Sylvain Rochon
MECP security specialist
Tech support for remote starters
26 Years of experience counts
I'm here to help.
Posted By: syl20rochon
Date Posted: October 24, 2009 at 7:08 PM
I've got a diagram that I can send you, it is a pdf file...I would need your email address.
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Sylvain Rochon
MECP security specialist
Tech support for remote starters
26 Years of experience counts
I'm here to help.
Posted By: start25
Date Posted: October 24, 2009 at 7:18 PM
I understand that, but the thing is, the alarm keeps going off even if the trigger wire from the alarm is not connected at all.
Posted By: syl20rochon
Date Posted: October 24, 2009 at 7:20 PM
ok, do you have any other switches connected...truck cap???? or others???? It doesn't mean that it's the actual doors!!!!
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Sylvain Rochon
MECP security specialist
Tech support for remote starters
26 Years of experience counts
I'm here to help.
Posted By: start25
Date Posted: October 24, 2009 at 7:23 PM
The hood shut down switch wire is connected, thats it....
Posted By: syl20rochon
Date Posted: October 24, 2009 at 7:24 PM
Have you tried disconnecting it?
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Sylvain Rochon
MECP security specialist
Tech support for remote starters
26 Years of experience counts
I'm here to help.
Posted By: syl20rochon
Date Posted: October 24, 2009 at 7:30 PM
Since you're using the positive door input, I would use a relay and make the door trigger input rest at ground.
85= Ground
86= Vehicules door trigger output
87= +12v
87a= Ground
30= Door trigger input from alarm
If there's a fast pulse that comes on the line, it would probably be too weak to trigger the relays coil on a 30amp bosh unit. ------------- Sylvain Rochon
MECP security specialist
Tech support for remote starters
26 Years of experience counts
I'm here to help.
Posted By: el ranchero
Date Posted: October 24, 2009 at 9:35 PM
u are problably getting s trigger when the doortrigger goes to sleep, after like 15 minutes or so the bcm shuts down everything that is not esential to the car, u might have to go directy to the door latch triggers. i seem to remember i had the same problem with the explorer.
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rocker
Posted By: chev104275
Date Posted: October 25, 2009 at 6:43 AM
on my 2000 f150 i went right on the dome light in the headliner
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If i Can't Install it I Don't need it Joe
Posted By: syl20rochon
Date Posted: October 25, 2009 at 2:32 PM
Was the wire BLACK/ blue (+)? ------------- Sylvain Rochon
MECP security specialist
Tech support for remote starters
26 Years of experience counts
I'm here to help.
Posted By: el ranchero
Date Posted: October 25, 2009 at 4:02 PM
yeah, it black blue positive, find the latch triggers on each door, like i said probably the bcm is shutting down the cars electrical system and that is why it is falsing, u know it being a while but i think we used a relay to solve the problem, try this hook up 85 and 87a toghether and hook this up to the black blue of car, know hook up 30 to your alarm positive trigger, and 86 to ground, i think this is how we solve the problem if not u need to go to each latch trigger of the doors and they are negatve polarity. good luck!
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rocker
Posted By: chev104275
Date Posted: October 25, 2009 at 4:39 PM
yes i beleive the wire was BLACK/ lt blue its been about 5 years since i installed it
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If i Can't Install it I Don't need it Joe
Posted By: start25
Date Posted: October 25, 2009 at 4:43 PM
Guys... like I said the door trigger is not connected at all and still alarm going off like every 40 min. and the icon on remote shows that door opened...
Posted By: syl20rochon
Date Posted: October 25, 2009 at 4:49 PM
I don't believe that wiring your door trigger to this relay will do it, after analysing your relay, your alarm will never see the door trigger thus solving the problem but the alarm will never see the doors open cause pin 87 is left without any connection. I would wire it as follow: 85 & 87a to ground, 86 to BLACK/ blue (+), 87 to +12v and 30 to door trigger input of your alarm. That way, if your bcm monitors before shut down, the pulse shouldn't be triggering the relays coil and your door trigger input will remain at ground not tripping the alarm but if someone opens the door, the relay will trip letting 12v thru pin 30 tripping the alarm....that's my point of view...but I do believe that going to each door pins while isolating with diodes will give you best results.
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Sylvain Rochon
MECP security specialist
Tech support for remote starters
26 Years of experience counts
I'm here to help.
Posted By: syl20rochon
Date Posted: October 25, 2009 at 4:51 PM
But then again, if you alarm triggered with the door input not connected....check your hood pin switch connection or you may have a defective brain.......
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Sylvain Rochon
MECP security specialist
Tech support for remote starters
26 Years of experience counts
I'm here to help.
Posted By: el ranchero
Date Posted: October 25, 2009 at 7:42 PM
yeah, i didnt read the part where u say u dont have thedoor hooked up and still u get a falsing, than its a bad brain, try this with a disconetc everything from the brain and with the metal part of the screw driver touch all the pins this will short all the pins out and hoppefully will reset the brain.
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rocker
Posted By: syl20rochon
Date Posted: October 25, 2009 at 7:54 PM
Strange question, what did you do with your negative door trigger input? a floating ground can easily do this....you may need to connect it to 12v to make sure it does not pickup anything....if it has been cut and taped against other wires, they might be touching and also creating the problem.
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Sylvain Rochon
MECP security specialist
Tech support for remote starters
26 Years of experience counts
I'm here to help.
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