sensors on instant trigger

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godd dan it

Copper - Posts: 446

Joined: July 01, 2004

Location: New Jersey, United States

Posted: September 23, 2010 at 10:55 PM / IP Logged

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.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: September 24, 2010 at 4:41 AM / IP Logged

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

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: September 24, 2010 at 4:51 AM / IP Logged

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.

t&t tech

Platinum - Posts: 2,608

Joined: October 05, 2008

Location: Trinidad and Tobago

Posted: September 24, 2010 at 6:32 AM / IP Logged

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.

KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: September 24, 2010 at 7:49 AM / IP Logged

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.

Kevin Pierson

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: September 24, 2010 at 9:16 AM / IP Logged

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.

godd dan it

Copper - Posts: 446

Joined: July 01, 2004

Location: New Jersey, United States

Posted: September 24, 2010 at 5:51 PM / IP Logged

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.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: September 25, 2010 at 2:06 AM / IP Logged

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

godd dan it

Copper - Posts: 446

Joined: July 01, 2004

Location: New Jersey, United States

Posted: September 25, 2010 at 7:15 PM / IP Logged

howie ll wrote:

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

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?

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: September 25, 2010 at 8:21 PM / IP Logged

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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