problem with alarm, 1987 volvo 740
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=126662
Printed Date: May 07, 2025 at 10:43 AM
Topic: problem with alarm, 1987 volvo 740
Posted By: 740r
Subject: problem with alarm, 1987 volvo 740
Date Posted: March 22, 2011 at 12:16 PM
Hello.
I've problem with my car alarm installation. I hope maybe someone can help me with the installation.
I dont know what the name are on the larm. But i can read Ultimative Locking System on the carton.
This alarm im will put in to my Volvo 740 '87 with centrallocking system.
I hope u want to help me and im so sorry for my english :)
Replies:
Posted By: KPierson
Date Posted: March 22, 2011 at 12:38 PM
What is the problem you are having?
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Kevin Pierson
Posted By: 740r
Date Posted: March 22, 2011 at 12:55 PM
KPierson wrote:
What is the problem you are having?
I have problem with the cablage to the doors. And where the cables to and from the relay going.
Posted By: howie ll
Date Posted: March 22, 2011 at 3:52 PM
Just to throw a spanner in the works you will probably need an actuator in the driver's door.
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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: 740r
Date Posted: March 22, 2011 at 4:58 PM
Has someone heard something about Ultimative Locking System?
It's from FK automative.
Posted By: 740r
Date Posted: March 23, 2011 at 5:55 AM
Please help me now :)
Posted By: howie ll
Date Posted: March 23, 2011 at 7:53 AM
First of all, that brand is completely unknown so I wouldn't worry too much about installing it.
Secondly what do we know about your car?
Does it have central locking and can you lock and unlock all the doors from the passenger side?
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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: 740r
Date Posted: March 23, 2011 at 8:54 AM
Okey. Its has centrallocking system from factory so itsnt aftermarket system. I lock and unlock from driverside.
Posted By: howie ll
Date Posted: March 23, 2011 at 10:10 AM
Which means you will need an actuator in the driver's door. Can you print the installation instructions?
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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: 740r
Date Posted: March 23, 2011 at 10:23 AM
The instructions is 30km from me. So no. Its little hard to do that.
Posted By: 740r
Date Posted: March 24, 2011 at 4:48 PM
Now its looks like i've found the real name of my alarm.
Thor TH446.
Posted By: howie ll
Date Posted: March 26, 2011 at 6:18 PM
Which doesn't mean a thing, once more do you have a wiring schematic?
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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: 740r
Date Posted: March 27, 2011 at 5:40 AM
For the car? Well i take a pics on the wiring diagram to the alarm. But i dont think you see something.
I write down whats color and where that go.
Wires from 12pins contact
Orange LOCK
White LOCK
Yellow LOCK
ORANGE / Black UNLOCK
WHITE/ Black UNLOCK
Yellow/Blck UNLOCK
Black GROUND I've found that
RED / Black OPEN TRUNK
Red 12v I've found this to
Pink Siren
Brown Turnsignals
Brown -|
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2 pins contact
For the led light
7 pins contact
Yellow TO THE RELAY - But to witch contact i dont know
Blue/BlackWINDOW CLOSER
Orange Break
Blue Door switch
White IGNITION
Second 2 OVERIDE SWITCH
4 pins contact
To shock sensor
The relay has this cables ;
White
Green
Green
Yellow
But where could i put this?!
In next week can i take better photo.
Posted By: 740r
Date Posted: March 27, 2011 at 5:43 AM
https://www.volvoracing.se/Volvo%20Info/700,%20900/El-Scheman/Haynes%20700/Haynes%20El-schema%20Volvo%20740%20760%201987.pdf
Wiring diagram for Volvo 740 -87
Posted By: howie ll
Date Posted: March 27, 2011 at 5:55 AM
No good at all, those lock and unlock wires should be marked as common, NO and NC.
RED / Black trunk open is irrelevant to your car.
Blue door switch, this also needs to be connected to trunk and hood switches via diodes, that's assuming these switches still work after 24 years. You will have to provide a hood switch.
I have to know what those colours are on the relay, it's a starter cut.
I'm guessing white goes to 86 and joins to your ignition white.
Yellow to 85.
Cut starter wire, key side to green at 87a, starter side to green at 30.
Needs a 1N4004 diode (unless already provided) between 86 and 85 with the band to 85.
The problem is from your questions, your knowledge and maybe skill levels are not enough to achieve this.
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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: 740r
Date Posted: March 27, 2011 at 6:40 AM
Yes the door cables are markt with that.
So how i connect the door cables? I have electrical open to my trunk.
Posted By: howie ll
Date Posted: March 27, 2011 at 7:32 AM
Then you will need another relay and diode for the trunk release unless your switch is negative powering a relay.
Can you at least tell me which of the lock wires is which?
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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.
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