1991 Ford Probe LX

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=40856
Printed Date: May 19, 2025 at 3:52 AM

Topic: 1991 Ford Probe LX

Posted By: jamac010
Subject: 1991 Ford Probe LX
Date Posted: October 14, 2004 at 7:59 AM

Im trying to install an alarm system. I need to lock and unlock the doors. I found that this car had a single wire that locks when 12V+ is applied and unlocks with 12V+ through a 4.7K ohm resistor from the link below.

https://www.the12volt.com/doorlocks/page2.asp#fp

However my alarm has positive outputs from the alarm with the lock and unlock. Can someone clairify how to do it? Theres a diagram but for negitive alarm outputs.

Thanks

James

Replies:

Posted By: mo12v
Date Posted: October 14, 2004 at 8:20 AM

If U have + (positive) Outputs from Alarm, hook Lock wire to the GREEN/ Black and the UNLock wire to 4.7k resistor, then hook that also to the GREEN/ Black
or
Use Positive Pulse thru 2 SPDT Relays

Power Lock	GREEN/ BLACK	SINGLE WIRE
Power Unlock	GREEN/ BLACK	SINGLE WIRE *

Single Wire Resistor Door Locks
. * Single Wire Door Lock System. GREEN/ BLACK Wire Requires A 12 VDC (+) Pulse To Lock Doors And A 12 VDC (+) Pulse Thru A 4.7K Ohm Resistor To Unlock.

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MO

Don't Learn from Others Mistakes
You Might Be the One That Knows.

Posted By: jamac010
Date Posted: October 14, 2004 at 10:09 AM

Yes that would work however. The alarm supplys a constant +12VDC until the remote is pressed. Then the volts drop to 0 for a brief moment. I need to hook it up to relays but want to know how it is different then the diagram from the link which has negative triggers.

Thanks

James

Posted By: huntersdad
Date Posted: October 14, 2004 at 10:21 AM

does the alarm go to 0 volts or to ground.... put your meter on conitnuity and see when u unlock or lock if the meter has a beeping sound if it does then follow the diagram u found

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u ever flew on the ground?

Posted By: Velocity Motors
Date Posted: October 14, 2004 at 12:45 PM

What kind of system do you have? From the sounds of things the unit has alternating polarity door lock outputs.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Posted By: jamac010
Date Posted: October 14, 2004 at 1:35 PM

I have a Option group. One of those cheap ones from ebay.

Posted By: jamac010
Date Posted: October 14, 2004 at 4:51 PM

Ok I set it up with relays like the one in the links..Lock works but unlock doesnt. I found that alarm grounds as if you put a ground wire to the terminals the car and unlock perfect. I think there maybe something wrong with the alarm module itself. I think both the lock and unlock wires from the alarm used to put out +12VDC. Now the lock is putting out 12v and the unlock 1.5v.

When testing those with a multimeter the lock with drop to 0v (ground) and the unlock with stay at 1.5v constant.

Think I somehow messed up the alarm unit with testing wires?

James