door trigger diode isolation

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=127133
Printed Date: April 23, 2024 at 1:02 AM

Topic: door trigger diode isolation

Posted By: jamesbissland
Subject: door trigger diode isolation
Date Posted: April 27, 2011 at 1:46 AM

Hi All,

I dont know an awful lot about electronics, but I know just enough to be dangerous :)

I am looking to do the ol' diode isolation trick to stop my dome light playing havoc with the alarm in my 01 Subaru Outback; following along the lines of

posted_image

The question I have is...

It looks like I can put the diode any where between the door switch/trigger output and alarm input..

To save pulling my dash apart and trying to find where the guy that installed my alarm hid it, can I put a diode directly behind the door light switch in the pillar of each door jam?

Hmmm

Many thanks in advance
James

Replies:

Posted By: howie ll
Date Posted: April 27, 2011 at 2:47 AM

You shouldn't need it so how is your dome light playing havoc?
More likely a faulty door switch.

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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.

Posted By: jamesbissland
Date Posted: April 27, 2011 at 3:32 AM

thanks for your reply

when i arm my alarm while the dome light is fading out it puts it into zone by-pass mode and makes all sorts of beeps to let you know.
it arms fine once the dome light has gone out.

i just hate the attention it attracts when it makes its wee song and dance to let you know its in zone by-pass, and im getting sick of standing around for 30 secs while i wait for the light to go out!

Thanks again :)

Posted By: howie ll
Date Posted: April 27, 2011 at 3:36 AM

The installer should have seen to that, either with his install or programming a dome or courtesy light delay on the alarm.

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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.

Posted By: jamesbissland
Date Posted: April 27, 2011 at 3:56 AM

yeah, dont get me started on him!!

unfortunately the alarm doesnt have that function to program, so i was looking for the next best thing.

reading up on this way looks to be pretty straight forward, i just wanted to confirm things before i started :)

Posted By: howie ll
Date Posted: April 27, 2011 at 4:18 AM

That car shouldn't give any problems, just wire the door trigger wire to one of the door trigger wires, the use of diodes has nothing to do with 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.

Posted By: jamesbissland
Date Posted: April 27, 2011 at 4:27 AM

hmm im clutching at straws as to what it can be.

whats all the talk about diode isolating for delayed dome lights all about then?

Posted By: howie ll
Date Posted: April 27, 2011 at 5:10 AM

Nothing to do with the delay, it's when the factory uses processors and timers to control dome lights amongst many other things, these vehicles, like e.g. Fords use separated feeds from each door, tailgate and hood. They're known generically as body control modules. I did loads of Impies from around that time and had no problems. I suggest your man has taken his door trigger from the dome (courtesy) switched (via the door pins and a timer) rather than one of the door pins which should be adequate on that car. Japanese car manufacturers were very late adopters of these control modules, they got their electrics right in the first place.

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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.

Posted By: t&t tech
Date Posted: April 27, 2011 at 5:34 AM

Yup, it's just a matter of getting at the triggers before they pass through the processors, and a diode directly behind the doopr pins would make no sense at all.

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COMMIT YOUR WAY TO JEHOVAH AND HE WILL ACT IN YOUR BEHALF. PSALMS 37:5

Posted By: jamesbissland
Date Posted: April 27, 2011 at 1:29 PM

that is great info guys!!

thankyou both very much!! I was starting to pull my hair out!

and thinking about it, that makes perfect sence!!!

will let you know how I get on :)

thanks again

Posted By: KarTuneMan
Date Posted: April 28, 2011 at 12:46 PM

The keyless module is BEHIND the glove box on that rig.... the smartest place to get ALL door(s) trigger's

You said "don't get me started" when reffering to your installer, so who knows where HE picked up the door trigger.

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Posted By: KarTuneMan
Date Posted: April 28, 2011 at 12:47 PM

Its a little "black box" It's labeled keyless entry unit.....

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Posted By: jamesbissland
Date Posted: April 28, 2011 at 1:41 PM

thanks for that
pulled my glovebox out and bingo :)

yeah, not only was he a mobile alarm installer, he also appears to be a magician as he has demonstrated his other skill.. a great disappearing act