Door trigger & diode

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sampoarE34

Member - Posts: 15

Joined: February 03, 2003

Location: Netherlands

Posted: February 20, 2003 at 1:40 PM / IP Logged

Hi,

I am installing a commando FM-760 alarm,

but the alarm has only 1 door (-) trigger input and my car 3 wires (driver,pass,rear doors) i want to use

diode to isolate the 3 wires from eachother.

But what ever diode i use the system will not trigger at all,i dont measure GROUND (-) at end of diode (mark facing the door-wire) when door is open en before the diode at door wire side i DO measure GROUND/NO-GROUND when doors are open/closed.

For some case the diode is never letting any signal trough i tried reverse direction/polarity of the diode without success.

Velocity Motors

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Joined: March 08, 2002

Location: Manitoba, Canada

Posted: February 20, 2003 at 1:56 PM / IP Logged

What year, make & model vehicle is this ?

Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

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sampoarE34

Member - Posts: 15

Joined: February 03, 2003

Location: Netherlands

Posted: February 20, 2003 at 3:20 PM / IP Logged

Its a BMW 520i from 1992.

Negative door locks,

i measure ground when door open en no-ground connection when doors closed all 3 wires (2 front,1 for both rear doors) but using diode the diode seems to block the circuit before the diode i still measure ground/no-ground but after the diode only no-ground so no connection when door opens or closed...

please help i tried different diodes 1N5408,1N4106,1N4104

Velocity Motors

Moderator - Posts: 12,488

Joined: March 08, 2002

Location: Manitoba, Canada

Posted: February 20, 2003 at 3:28 PM / IP Logged

I have some conflicting information but you will need to see what is right by testing:

DOOR TRIGGER|br/gry,br/blu,br/ppl|- |anti-theft plug

* Anti-theft plug or module located under rear seat on passenger side. Door wires also found at general module under rear seat on driver's side. Be careful handling this module, as rotating it can cause underseat grommets to suck out, allowing eventual water damage to the electrical system. Domelight supervision wire BROWN / red at anti-theft plug.

All DoorTrigger YEL/BLU (-) DRIVER'S SIDE UNDER REAR SEAT BIG HARNESS

Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

sampoarE34

Member - Posts: 15

Joined: February 03, 2003

Location: Netherlands

Posted: February 20, 2003 at 3:45 PM / IP Logged

This is right : DOOR TRIGGER|br/gry,br/blu,br/ppl|

I used this wires thats not the problem.

the problem is the alarm box only got 1 door trigger input (-) so i want to isolate the 3 door trigger wires but when i use a diode the system doesnt trigger at all when armed & opening a door on purpose.

Because the diode seems to block flow from the - signal coming from door too the alarm box.

Reversing de diode doesnt solve problem.

I got the big-strip-mark facing the door-wire coming from door-contact-switch but no signal using DIODE.

without diode it works but i want to isolatie 3 door wires.

Velocity Motors

Moderator - Posts: 12,488

Joined: March 08, 2002

Location: Manitoba, Canada

Posted: February 20, 2003 at 3:57 PM / IP Logged

You have them like this diagram:??

Door trigger & diode -- posted image.

Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

sampoarE34

Member - Posts: 15

Joined: February 03, 2003

Location: Netherlands

Posted: February 20, 2003 at 3:59 PM / IP Logged

Yes thats right,

but i dont measure any ground after the diode.

before the diode (on the door-trigger side) i DO measure ground when door is openend,

so with the diode in place the system is not triggered at all,seems to bee diode is blocking all current.

Could the - signal be to less Voltage (V) so it blocks flow to the alarm box?

Velocity Motors

Moderator - Posts: 12,488

Joined: March 08, 2002

Location: Manitoba, Canada

Posted: February 20, 2003 at 4:17 PM / IP Logged

You should be only using a 1N4001 1 amp diode. The ones you have may be too large ( 3 - 6 amp ).

Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

Phill McCrank

Member - Posts: 32

Joined: February 16, 2003

Location: United States

Posted: February 20, 2003 at 6:40 PM / IP Logged

try using relays. you need three relays. connect the door triggers to 86 (one to each relay)

12v to 85

ground to 87

30 to alarm brain

Phill Bowen

Lead Installer,

Master of all trades.

camino

Copper - Posts: 54

Joined: October 15, 2002

Location: Mexico

Posted: February 25, 2003 at 8:20 PM / IP Logged

no need to use relay's,just install the diodes with the white strip facing the door pins,or the wire's ok?

diodes work like a bridge,only facing the white stripe to the most negative side.

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