convert negative trigger to positive
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=93665
Printed Date: June 10, 2024 at 7:36 PM
Topic: convert negative trigger to positive
Posted By: yz04
Subject: convert negative trigger to positive
Date Posted: May 06, 2007 at 1:20 PM
I have a 2004 Ford Focus 4 door sedan. I recently installed a Scytek Galaxy 5000 RS alarm. Everything seems to work perfectly, but I believe that my negative door trigger wire is defective (I have already posted on my trigger wire problem, to no avail). Is there any way I could convert the negative signal coming from my car into the positive input that my RS can understand? Posssibly with relay?
In case any of you didn't see my last post, to sum it up my negative door trigger always rests at ground with my negative door wires, whether the door is open or not. I have all four doors isolated with diodes already, and it "used to work" with my old alarm.
Replies:
Posted By: enice
Date Posted: May 06, 2007 at 1:31 PM
it always rests at ground wether the door is open or not???? the only possibe setup you can have is the wire going from 12v to 0 or 0 to 12v with the door open then closed....is the instrument cluster showing there is door open? and or is the scytek galaxy giving you an error that a door is open?
Posted By: yz04
Date Posted: May 06, 2007 at 1:43 PM
My status LED won't turn off, that's one of my clues.
I had an older astra alarm on my car hooked up to the same door triggers/trigger isolates, and the LED would turn off when I would close my doors. This time it isn't doing that
Posted By: enice
Date Posted: May 06, 2007 at 1:48 PM
well when the led wont turn off it usually means that it thinks that a door is open,,,,if you have a negative trigger alarm wire and you connect it to the wire that always has negative then it will not arm. remember what i stated ealier..when you open that door that wire either should go from 12v to 0 or 0 to 12v with the multimeter connected.
Posted By: yz04
Date Posted: May 06, 2007 at 2:00 PM
It's so strange though, I had it working on my previous alarm. I went to the wiring module (GEM) behind my glovebox, and I tapped the four door trigger wires there. Actually I don't have a multimeter, but I had the instructions for hooking up/locating the wires for my particular car. If that's not enough, I even bought a factory shop manual with all the wiring diagrams for my model year Focus. It even briefly describes what each wire going into each connector is for!
Maybe I'll FINALLY invest in a multimeter later today :D
Posted By: yz04
Date Posted: May 06, 2007 at 2:03 PM
OH and I even connected my four triggers/isolates to my trunk trigger just as a test, and my status LED would turn off when I would close my door(s)
Posted By: enice
Date Posted: May 06, 2007 at 2:04 PM
You have to....never connect without testing...lucky that you didnt connec an output from an alarm to a wire that wasnt the wire that you needed. For the 2004 ford focus, The LF door is BLACK / YELLOW in the tan plug, pin 22. The RF door is BLACK/ blue in the tan plug, pin 21. The LR door is BLACK/ orange in the green plug, pin 15. The RR door is BLACK/ green in the gray plug, pin 18. Use all four wires and diode isolate each.
The GEM is above the passenger kick panel. and by the way how did you tap with the diodes.... the diodes must be connected a certain way. it cannot be inversed..
Posted By: yz04
Date Posted: May 06, 2007 at 2:08 PM
I have the stripes on the car side of the diode (facing away from alarm).
Posted By: enice
Date Posted: May 06, 2007 at 2:15 PM
get a dmm. its a must for an installer....thats the only way to know for sure if you connected it right or not.
Posted By: howie ll
Date Posted: May 06, 2007 at 4:48 PM
Comment on above. In Uk Ford are using same colour for multiple functions, TEST!! Also diode between CPU, band away from CPU (Gem) towards alarm otherwise sleeper circuit when it wakes up will send a pulse towards (checking) door contacts that will trigger some alarms.
Posted By: swerve
Date Posted: May 07, 2007 at 6:37 PM
the gem module on an 04 focus doesnt "go to sleep". The only ones that do are the bigger ford trucks. If you wire the diodes with the bands facing the alarm, the alarm would never see the door triggers as ground would not be allowed to flow through the diode, the stripes facing the alarm would only apply to vehicles with + door triggers. your best bet would be to pull the door triggers and check each one to see wich one is shorted to ground as that sounds like your problem if they are showing ground with doors open or closed. as for the way you have the diodes right now, it is correct, stripe facing the gem module. ------------- git yer swerve on!
Posted By: mikvot
Date Posted: May 07, 2007 at 10:02 PM
Swerve........I think howie was talking about, in addition to the 4 diodes goin to the alarm.....cutting each door trigger wire and inserting a diode inline, which is a common fix to the ford falsing problem.
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Posted By: howie ll
Date Posted: May 08, 2007 at 3:44 AM
Yes I was! It's on the directed web-site and in UK all Fords with the GEM or UK equivalent poste '02 shut down and sweep the door contacts etc. approx. every 65mins. I may have got the banding wrong way round (I always have to think it out when I'm doing it!) This is easier than using a relay or 10kr to live; you're letting the signal from the contacts get to the vehicle module but not feeding back to the alarm so you need 9 diodes in a foor door and trunk car.
Posted By: howie ll
Date Posted: May 08, 2007 at 3:51 AM
Directed website, resources,technical document 1073, look at it, I always use it for Fords, VW tailgate (hatch or trunk) is another also Fiat Punto trunk.
Posted By: swerve
Date Posted: May 08, 2007 at 2:38 PM
i know what howie was talking about, and he is correct for uk fords. but for the current vehicle, which is a non uk focus, the above mentioned is not neccesary. I was simply trying to clarify the subject and get to the real problem not confound the situation more by adding other variables to take into account. and yes howie you had it right the first time with the bands to the alarm when doing a gem module wake up. ------------- git yer swerve on!
Posted By: howie ll
Date Posted: May 08, 2007 at 6:04 PM
Swerve I know I'm a pedantic mustard BUT I've worked on one US spec Focus and apart from driver knee trim, flashers/sidelights and front grill the electrics appeared the same, hell the looms come from the US, (auto) gearboxes from Mazda, engines from Wales or London and body panels from Belgium or Germany. Look at the Saturn Astra, it's a Vauxhall Astra here! That GEM box sits above throttle pedal here, behind glovebox in US and has either 2 or 4 plugs depending on spec. Correct so far? In 2001 we had a major electical system change e.g. wiring at haz switch went CAN etc. We have had a newer body shape since 2005 (aka Volvo V50, Mazda 3 and Land Rover Freelander) with our Focus ST having Volvo T5 engine and running gear (Yes it goes like doodie off a shovel) you should get the new shape soon. I do remember that the US model had the same pin connections to that box ie door contacts, lock unlock and deadlock, even the same colours. In UK it's made by Siemens (They make body control boxes for every manufacturer in Europe, shame the pin configurations are all different). Regards NB This problem with sleep surges spiking the door contacts, I have found that not every vehicle suffers but it's not worth taking the chance!
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