sensors on instant trigger

Ok so I have a problem with a newer Chevy Monte Carlo. The problem is that the alarm keeps going off about 20 mins. after you arm it. Is it possible to have too many sensors on an instant trigger wire? Right now theres a backup battery, digital tilt switch, sonic sensor, trunk, and hood pin all connected to the instant trigger. Each one is diode isolated and everything is installed correctly. All sensors are turned down to a low setting. Do I have to hook up a relay or something?

BTW, I know for a fact that its the instant trigger because on the LCD remote, the trunk is triggered. So the door triggers are ruled out in this case. Sorry for the 2nd post.....trying to get to the bottom of this.

Thanks.

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Far too many! One thought, tilt sensor, hate them! Disconnect the extra sensors one at a time and then test.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

The other thought is a sleeper circuit , where you've joined to the trunk circuit place a diode in line before the join with the band towards the join. Ref: the infamous DEI 1076 tech sheet which should be on this site.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Yes as howard said ,best bet,  too many sensors, they may be interfering with each other.

Also don't make multiple threads about the same topic.

I would go the other way on this Howie - disconnect ALL sensors and see if the problem goes away first.

If it doesn't fix the problem, investigate the alarm itself (or even a sleep circuit).  If it does fix the problem, add one sensor back at a time until the problem comes back.  This may be a time consuming task but it will get to the bottom of it.

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Kevin Pierson

Sorry, Kevin's absolutely right, I was letting my hate of tilt sensors get away from me.
ref the 30 minute interval, if that's an exact 30mins, I'd have another look at what I said about diode block.
I can think of two European cars, VW Golf/Jetta and Fiat Punto where the trunk triggers feed INTO the body control unit and are subject to the sleep circuits doing a timed check run but the dome light feeds are on the OUTPUT and don't need dioding.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Im going to try the DEI 1076 wiring option A- with the relay. Im pretty sure its the trunk trigger/BCM that is causing it. I disconnected all the sensors and it still went off. Thanks for the help.

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You won't need a relay, a simple diode as I already explained does the trick.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

howie ll wrote:

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You won't need a relay, a simple diode as I already explained does the trick.

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Ok let me get this straight. I have a diode inline for the trunk wire already along with the rest of the sensors each with their own diode. All the diodes are placed with the band away from the alarm. You are saying to wire another diode for the trunk wire but this time....with the band towards the alarm and before the join?

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Yes. That wire is going from the trunk switch to a trunk light and also to an ECU or body control module or multifunction module, whatever the manufacturer calls it.
Switch in trunk is joined at some point by the (blue?) trunk wire from your alarm.
Between your join and the front module place the diode. The way I've told you this diode lets the "trunk open" signal go to the module but the 20 minute spike when the sleep circuit "wakes up" doesn't go back from the module to the alarm.
Look again at the 1076 diagramme, that's what is happening.
I agree it's counter-intuitive, I always have to think it through when I'm doing it.


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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Ok I understand now. Thanks for your help.

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Ok so I wired in the diode the opposite way. The only problem is that the trunk trigger doesnt work at all after you arm it. (Thats why I questioned this)

I did figure out that the alarm goes off exactly at 10 mins after you arm it. Im pretty sure its the BCM shutting down. I just gonna wire in a relay for the door triggers and the trunk trigger. I talked to another tech and they said to do it.

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Update:

I wired in the relays (1 for the door triggers and 1 for the hood/trunk trigger) just like the DEI 1076 diagram. Everything works fine and the alarm doesnt go off after 10 mins. Even waited some extra time and it still didnt go off. "Whew" Ive installed alarms on a few GM vehicles (same type of BCM's) before and only had to diode isolate the door triggers.....never had to wire in relays too. This is the first time that I installed/messed with an Autopage alarm.....maybe they pick up false triggers more easily? I dont know, but im just glad its fixed now.

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Don't want to sound rude but I've never seen relays on a 1076, I just use (loads of) diodes.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

howie ll wrote:

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Don't want to sound rude but I've never seen relays on a 1076, I just use (loads of) diodes.

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https://www.velocitymotorsport.com/images/install_notes/149.jpg

Diagram A....thats how I wired it.

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Ok, sorry but:
a)Never needed a relay.
b)The original DEI diagramme doesn't show a relay.
Of course if the alarm manufacturers made their sensing circuits less sensitive we wouldn't have this problem.
I believe A/vox has a trigger wire for just this eventuality.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Hmm.....well all I can say is that the diodes alone didnt help, but the relays solved the problem. Thats all I can say. I talked to Autopage tech support and they said to wire in relays to isolate too.

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Over sensitive trigger circuit, thankfully we don't get them over here. There's a third method, strapping a 10k resistor between the offending wire and your 12v+ power wire.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.