Central locking and alarm
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=34171
Printed Date: June 06, 2024 at 9:55 AM
Topic: Central locking and alarm
Posted By: djrock
Subject: Central locking and alarm
Date Posted: June 19, 2004 at 10:12 AM
Hello can anyone help me? I have a J reg ford Fiesta Flight and I have bought a shark Professional Expandable Car Alarm with Battery Backup Facility which has a grounded when armed wire which say it can be connected to an central locking interface but as I have seen you can uses relays to lock/unlock the central locking can anyone help me with this? I am not an expert with electronics but I know what I am doing some of the time. Thankyou djrock
Replies:
Posted By: draasch
Date Posted: June 19, 2004 at 11:37 AM
where are you located??/
when you lock the drivers door with the key, does all of your doors lock???? ------------- Good Luck
David
Ace Security
813-376-9778
Tampa
Donate to the 12volt
Posted By: djrock
Date Posted: June 19, 2004 at 6:46 PM
I live in the uk. When i lock the drivers door all four doors lock. thankyou
Posted By: Javelin3o4
Date Posted: June 20, 2004 at 3:30 AM
why not install an actuator in the drivers door so when the alarm is armed/disarmed it will lock/unlock the driver door thus locking/unlocking all doors?
Posted By: djrock
Date Posted: June 20, 2004 at 5:42 AM
What is a actuator how does it work, how do you wire it to the alarm and central locking. thankyou djrock
Posted By: draasch
Date Posted: June 20, 2004 at 2:14 PM
an actuator is another name for a door lock motor.
if you install one and operate it from the alarm, then it will in turn operate the rest of your door locks..... ------------- Good Luck
David
Ace Security
813-376-9778
Tampa
Donate to the 12volt
Posted By: djrock
Date Posted: June 20, 2004 at 6:22 PM
Is there an easier way of doing it? Like using the existing motor and connecting the alarm to it? How does central locking work (the technical side of it?) Is there always a voltage going to it because i can't get my head around connecting the 12v ground to the drivers door motor because when the alarms armed will it say lock the central locking then burn the motor out? HELP???? I will have to strip the front of the door and test what voltages i get when locked and unlocked. thankyou djrock
Posted By: auex
Date Posted: June 20, 2004 at 6:44 PM
What year?
-------------
Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.
I've been sick lately, sorry I won't be on much.
Posted By: djrock
Date Posted: June 21, 2004 at 3:14 AM
I think its 1991/1992 i would have to check the vehicle documentation to make sure which year it is.
Posted By: djrock
Date Posted: June 21, 2004 at 2:36 PM
My brother says it a 1992 j. I took apart the drivers door and i am sure the first connecter RED / yellow is 12v constant and brown is constant ground. On the second connector the white and yellow wires change polarity when locked then back when unlocked. djrock
Posted By: catch22
Date Posted: June 21, 2004 at 3:01 PM
wire two relays, reverse polarity. Basically one wire per relay
Posted By: djrock
Date Posted: June 21, 2004 at 3:14 PM
Sorry thats a little over my head. First of all is the central locking single wire? 3 wire negitive? https://www.the12volt.com/doorlocks/doorlocks.asp. I will need help on what relays to buy, how to wire them up, then wire them to the alarm and to the cars central locking. thankyou djrock
Posted By: djrock
Date Posted: June 22, 2004 at 1:32 PM
Where about does the central locking relay or what controls the central locking live in the car?
Posted By: dei user
Date Posted: June 22, 2004 at 4:41 PM
when u test the wires a multimeter or test light what do u get 12volts positive or 12v negative ------------- dei user
Posted By: djrock
Date Posted: June 22, 2004 at 4:47 PM
I am not sure. If i have the positive of my multimeter to the yellow and negitive to the white i think i got +12v if i do it the opposite way i would get -12v i cannot remember which way but all i know for sure is the polarity changes when locking the car.
Posted By: djrock
Date Posted: June 22, 2004 at 4:48 PM
I am not sure. If i have the positive of my multimeter to the yellow and negitive to the white i think i got +12v if i do it the opposite way i would get -12v i cannot remember which way but all i know for sure is the polarity changes when locking the car.
Posted By: djrock
Date Posted: June 25, 2004 at 4:48 PM
I found out if you touch the white and yellow together for 2 seconds all doors lock touch it again they unlock. If you send a gound voltage for 2 seconds to the yellow the doors lock if you ground the white for 2 seconds the doors unlock. So how would you wire the grounded when armed output to the central locking without blowing fuses if someone forgets to turn the alarm off and unlocks the car with the key?
Posted By: dei user
Date Posted: June 26, 2004 at 1:20 AM
u dont u wire it up to ur lock output wires coming form alarm make sure its on negative that is what the polarity reads on the locks if u say it locks with ground and unlock with ground the nthe polarity is ground read manuel and find two wires of different colors on the brain of the alarm one will say lock and the other will say unlock negative- the wire that says lock connect that to the wire that locks when u hit ground and the unlock with the wire that unlocks when u hit ground but just tap into the wire do not cut i repeat do not cut
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dei user
Posted By: Javelin3o4
Date Posted: June 26, 2004 at 1:43 AM
it would be a whole lot easier to just use a door lock actuator, just mount the actuator in the door panel, connect it to the lock rod, run 2 wires inside of the car up to a relay like a 451m, and your done.
Posted By: djrock
Date Posted: June 26, 2004 at 9:32 AM
The alarm has only one grounded output when armed. I can buy a central locking interface for the alarm but i want to see if i can make one up cheaper. I think i have sort of got a solution but its putting it in to electronics. When a ground is detected give power to the first relay for say 3 seconds. Which i would wired the relay to give ground to the yellow wire of the cars central locking this would lock the car. When the grounded when armed voltage is taken away the second relay gets power for 3 seconds which would send a ground voltage to the white wire of the central locking which would unlock the car. Would this work?? Or would it be less hassle to go out and buy the central locking interface? djrock
Posted By: cobycass
Date Posted: June 27, 2004 at 5:05 AM
hi pal i live in uk do you have msn messenger if so add me to your friends list and i will be able to explain everything you need plus its easier to explain talking rather than on screen cookiecarcare@msn.com if not then send me an email and i will reply to you with my mobile number and one way or another be able to point you in right direction would but dont want to put my number on here hope this helps
Posted By: djrock
Date Posted: June 28, 2004 at 7:19 PM
What i did is on saturday i bought the central locking interface and fitted it. I thought i would spend the money and i know its going to work with no problems. But i might have one problem i will have to test it and see if its going to be a problem. What i was thinking say if the car is locked by the key and you go to alarm it could it blow a fuse? djrock
Posted By: cobycass
Date Posted: June 29, 2004 at 3:47 PM
no pal it should just arm the system if door is already locked is it negative or positive locking do you know
Posted By: djrock
Date Posted: June 29, 2004 at 3:55 PM
The fiestas central locking changes polarity when locked then back when unlocked. djrock
Posted By: cobycass
Date Posted: June 30, 2004 at 4:42 AM
think you would be better taking to me on msn then be able to understand each other better will only be either negative locking or positive locking cant be both do you know what i mean
Posted By: djrock
Date Posted: June 30, 2004 at 7:13 AM
I think it could be negative since if i ground say the yellow wire in the drivers door of the cars central locking the car locks send a ground down the white the car unlocks can remember which way.
Posted By: Geehawk
Date Posted: July 01, 2004 at 9:51 AM
Hi Did you solve this problem? I would have thought that if the alarm has an output which is grounded when armed, and your C/locking has a lock and unlock wire both of which are activated when grounded then, all you should need is one 5 pin changeover relay. Common to ground, open contact to unlock wire, closed contact to locked wire, coil to +12v and your alarms grounded output. At rest the unlock pin would get grounded and the car unlock, when alarm is activated the lock pin would get switched to ground and the doors lock. Dont know if the relay being energized for the whole time the doors are locked would be a problem or not????? If you have sorted it, please post your solution as an answer would help out others reading this post.
Posted By: djrock
Date Posted: July 05, 2004 at 12:09 PM
I solved my problem by buying the central locking interface for the alarm. Thankyou all for your help!
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