sentra 92 door locks

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=4525
Printed Date: July 15, 2025 at 8:58 PM

Topic: sentra 92 door locks

Posted By: sufferrar
Subject: sentra 92 door locks
Date Posted: October 16, 2002 at 5:51 AM

hi, i have a nissa sentra 1992. here is the problem - i'm try to hook up the door locks to the alarm for remote locking/unlocking. it has a one wire system . when you ground the wire the door locks open and when cut it closes. i checked the door locks section in this web site and found (Nissan's Single Wire '91-'95 using 1relay and 1 diode and Nissan's Single Wire '91-'95 using 2 relays). What i don't understand is that the locks will only activate during the pulse and it will go back to the original position when the pulse is gone. tell me if i'm right or wrong . ??

Replies:

Posted By: sufferrar
Date Posted: October 17, 2002 at 5:42 AM

can any one shed some light ?

Posted By: ICKSTER40
Date Posted: October 17, 2002 at 8:39 AM

go into the drivers door, at the door lock switch see if theres a grey/red for lock, and a grey/blue for unlock, it should be a positive trigger.

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DJ,Scottsdale Extreme Sound

Posted By: sufferrar
Date Posted: October 17, 2002 at 9:08 AM

didn't get those wire. got a green with black stripe which when unlock goes to ground and when lock the wire is open.

it seems as when you ground this wire the locks open and when you remove the ground it closes ..I could use the (-)armed output to control the locks but i would loose the feature of ignition controlled locks. what do i do ?

All the relays for the door is built in the driver side control panel and the wire just goes to a connector at the panel . there is no way i could tap of any thing from in there unless i know the electronics in there(lots of i.c.'s and semiconducors). all i have to work with is the single wire .

Posted By: ICKSTER40
Date Posted: October 17, 2002 at 10:29 AM

IMG src="file:///C:/My%20Documents/My%20Pictures/Copy%20of%201w300d.gif"

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DJ,Scottsdale Extreme Sound

Posted By: ICKSTER40
Date Posted: October 17, 2002 at 10:30 AM

i hope that will help you

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DJ,Scottsdale Extreme Sound

Posted By: mobiletoys2002
Date Posted: October 17, 2002 at 10:32 AM

if it has a single wir elocking,unlocking sytem then you need one relay and wire it to cut the wire to lock. this is done by cutting that one wire in half and putting the switch side of it on pin 87a and the unlock wire on the same pin of the relay... then take the other side of the cut wire and put it on pin 30 from there you will take your lock wire from the alrm and put it on pin 85 and put 12 volts on pin 86 and that should do it for you. Your alarm has to be outputing a negative on the locking/unlocking outputs.

Posted By: sufferrar
Date Posted: October 17, 2002 at 1:37 PM

but i don't understand how will the locks remain open if the lock /unlock pulse are only going to keep the relay on as long as the pulse is there . meaning when i arm the car the lock pulse will turn the relay cutting the wire and close the lock - when the pulse is gone the relay will switch back and then the wire will be connected again causing the locks to open . you see the the output of the alarm lock/unlock are pulses(-) and not continuous - it's a continuous signal i need . i can use the neg armed output but i would not get the ignition controled lock/unlock .

Posted By: sufferrar
Date Posted: October 17, 2002 at 1:40 PM

lckster40 - could you send it again . don't understand what you wrote....?

IMG src="file:///C:/My%20Documents/My%20Pictures/Copy%20of%201w300d.gif"

Posted By: mobiletoys2002
Date Posted: October 17, 2002 at 1:42 PM

no it wont be connected again. pin 87a on the relay and pin 30 will always be connected at rest meaning the locks will never think the wire was broke.when you apply the unlock pulse to pin 87a the wire was not cut just a pulse was applied to it just the same as pushing the switch.you dont want a constant when the relay de-energizes the wire will go back on its own a complete circuit.when you apply a lock pulse to pin 85 you will break continuity on that wire meaning the circuit gets broke like you cutting the wire.the doors will lock thats all and go back the way they were .

Posted By: mobiletoys2002
Date Posted: October 17, 2002 at 1:45 PM

87a is the middle pin of a relay this pin is normally closed meaning always has continuity with pin 30 until voltage is aplied to the coil of the relay(pin85-86) when voltage is aplied the pins switch so that 87 and 30 have continuity but you wont connect anything on 87 therefore breaking the circuit and locking the doors. on unlock you are not breaking the wire you are giving it a (-)pulse to pin 87a to unlock do you understand now???

Posted By: mobiletoys2002
Date Posted: October 17, 2002 at 1:56 PM

On the '91-'95 300ZX and the '92-'95 240SX, locate the lock/unlock wire in the driver's kick panel or door jamb. When this lead is cut, or opened, the doors will lock. When this lead is grounded. the doors will unlock. If you have positive door lock outputs read next.

Posted By: mobiletoys2002
Date Posted: October 17, 2002 at 1:59 PM

do you see pin 87 not conected that is the break on lock when pin 85 gets power it will cause th pins to change from 30-87a to 30 87 giving you th ebreak and then go back to pin 87a when the lock pulse is gone.when the unlock pulse is on 30 or 87a it will unlock your car.

Posted By: sufferrar
Date Posted: October 18, 2002 at 5:36 AM

I wired this up yesterday when i reached home . i found this exact circuit that you described in my installation guide from my alarm.
The circuit did'nt work.
The only way to get the door to close and stay closed is to break 30 from 87a and leave these points open .
I understand what you are saying and understand the circuit -
From the drawing i think that i have a mis conception of both the orange coloured wire in the drawing(switch side of the lock /unlock lead and the door lock module). i have only one wire which goes to the driver control panel that is it . how do i determine from just one single wire -what goes on 87a and 30 .?

i have neg pulse outputs from the alarm.

Posted By: sufferrar
Date Posted: October 18, 2002 at 5:46 AM

i know what the problem is now . from the relay diagram i must have both 87a and 30 wrong . all i have to work with is a single wire that goes to the driver control panel . that wire connects to ground for open . does this single wire go to 87a or 30 ? and if i just have one wire , where do the other wire come from ?

Posted By: Ohmz
Date Posted: October 18, 2002 at 6:09 AM

you have to cut the door lock /unlock wire. It's like a stater kill. Connect the side that locks the door to 30.

87a connects to the other end of your door lock.unlock wire.

after that, just follow the diagram. Let us know!

Posted By: sufferrar
Date Posted: October 18, 2002 at 6:31 AM

if the wire is cut one end goes to ground and the other goes to the control panel . what puzzles me is that one end is goes to ground if the doors are open. I think that i may have to find another wire at the control panel to tap off.

Posted By: Ohmz
Date Posted: October 18, 2002 at 7:26 AM

oh ok I just read your previuos posts. You need a constant ground to keep the locks on. You probably have the wrong wire. Keep on looking for the wires that are posted.

Posted By: sufferrar
Date Posted: October 18, 2002 at 8:11 AM

i think you have it back wards . i need a constant ground will keep the locks open. when the wire is open the locks will close .

but i agree that i may have the wrong wire.

originally my car had central locking where the driver door controlled the other doors . when you use the key on the outside of the door key hole it pushes a switch which controls the other 3 doors .i replaced the switch with an actuator at the driver door and wired parallel to the others so now i have 4 power locks in parallel. one of the wire from the switch goes to ground and the other to the control panel . this is the wire i'm using to control the doors . the switch just closes or opens to ground.
my car also has a speed sensor that locks all doors at 15km/h. i don't think that this will affect anything but i'm still mentioning it .

i can use the neg. armed output from the alarm to control this wire but i wouldn't have the ignition controlled locks.!! i'll have to keep looking ....

Posted By: sufferrar
Date Posted: October 21, 2002 at 5:44 AM

I looked yesterday- no other wire other than the green with black stripe . one wire system - ground for doors to open , when removed from ground the locks open.

I even busted open the driver console panel to see if there are any hidden wires. i traced each point of the factory unlock/lock switch but it goes to some nitty-gritty semiconductors.

where do i go from here ? all help appreciated...!!!!!