What is a Key Sense Wire?
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=117302
Printed Date: April 29, 2024 at 5:40 AM
Topic: What is a Key Sense Wire?
Posted By: el ranchero
Subject: What is a Key Sense Wire?
Date Posted: October 27, 2009 at 8:51 PM
what is a key sense wire? is this when u insert the key in the key cylindar, on some cars if it needs this and i dont do it does that mean the car wont autostart? thanks for the help.
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rocker
Replies:
Posted By: i am an idiot
Date Posted: October 27, 2009 at 9:08 PM
Correct, some vehicles will not start if you do not connect the keysense wire.
Posted By: t&t tech
Date Posted: October 27, 2009 at 9:10 PM
That is the wire that switches state when the key is inserted into the ignition cylinder, from either power to ground or vice-versa, it is normally required when bypasses are being installed!
Posted By: howie ll
Date Posted: October 28, 2009 at 4:02 AM
Or to shut down the factory alarm when using a remote start, often not required on Euro Vehicles, unless you're confusing it with transponder immobiliser wiring.
Posted By: equate
Date Posted: November 12, 2009 at 6:17 AM
I dont really understand this wire either.
Do I have to connect it? I remember I installed one on Dodge Intrepid 2002. I didnt hook up this wire. But nothing happen, it still can be remote started.
Anybody tells me more about this wire? For example, Compustar CM5000 module, which wire is for key sense?
Posted By: Mike M2
Date Posted: November 12, 2009 at 6:38 AM
Few cars need it but some do. Toyota's with factory alarms need it connected to disarm. You connect it to the status output from the RS...
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Mike M2
Tech Manager
CS Dealer Services
Posted By: equate
Date Posted: November 12, 2009 at 1:13 PM
Mike M2 wrote:
Few cars need it but some do. Toyota's with factory alarms need it connected to disarm. You connect it to the status output from the RS...
thanks mike
Posted By: equate
Date Posted: November 12, 2009 at 1:18 PM
Mike M2 wrote:
Few cars need it but some do. Toyota's with factory alarms need it connected to disarm. You connect it to the status output from the RS...
by the way, if RS doesnt have status output, can it be hooked to IG?
Posted By: wblakes
Date Posted: November 12, 2009 at 2:12 PM
equate wrote:
Mike M2 wrote:
Few cars need it but some do. Toyota's with factory alarms need it connected to disarm. You connect it to the status output from the RS...
by the way, if RS doesnt have status output, can it be hooked to IG?
Toyotas don't need the keysense wire connected to remote start. it is just a way of disarming the factory alarm on Toyotas and Lexus. what i usually do is just use the Factory Disarm wire and send a pulse to the Unlock Wire to disarm it before remote start. that way i don't have to run a wire to the keysense wire.
Yes, you can use the negative ignition output to the keysense wire.
Posted By: Mike M2
Date Posted: November 12, 2009 at 3:58 PM
wblakes wrote:
equate wrote:
Mike M2 wrote:
Few cars need it but some do. Toyota's with factory alarms need it connected to disarm. You connect it to the status output from the RS...
by the way, if RS doesnt have status output, can it be hooked to IG?
Toyotas don't need the keysense wire connected to remote start. it is just a way of disarming the factory alarm on Toyotas and Lexus. what i usually do is just use the Factory Disarm wire and send a pulse to the Unlock Wire to disarm it before remote start. that way i don't have to run a wire to the keysense wire.
Yes, you can use the negative ignition output to the keysense wire.
The issue with doing it this way is the drivers door is unlocked during remote start.... ------------- Mike M2
Tech Manager
CS Dealer Services
Posted By: wblakes
Date Posted: November 12, 2009 at 4:45 PM
The issue with doing it this way is the drivers door is unlocked during remote start.... [/QUOTE]
all of the Directed products i've installed lock itself after the car starts. press the start button on the remote, driver's door unlock, car starts, driver's door lock. for other brands of remote starters, most of them have the option of sending a pulse signal after the car starts. if the remote starter have neither option, then the keysense wire has to be use.
Posted By: Mike M2
Date Posted: November 12, 2009 at 5:05 PM
To me that is an issue. I don't want my car unlocked while i'm not around even if it is only a few seconds.
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Mike M2
Tech Manager
CS Dealer Services
Posted By: wblakes
Date Posted: November 12, 2009 at 5:45 PM
Mike M2 wrote:
To me that is an issue. I don't want my car unlocked while i'm not around even if it is only a few seconds.
so what do you do for cars that require the routine? some cars arm and disarm with lock and unlock and do not have other means of disarm, then there is no way around it but to have it unlock before start.
Posted By: Mike M2
Date Posted: November 12, 2009 at 8:33 PM
Very few, some Accords from the early 2000's are indeed this way and you have to do like you state but i honestly can't think of any more right now(tho i bet there are some that i can't think of after a few beers i just had!). There are some that only arm/disarm with the factory remote but that wouldn't count here. Fords stay armed while RS, GM's and Chrysler's usually need a bypass that will disarm for you, Nissan will disarm with just the ignition, Most Honda's have a disarm wire.
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Mike M2
Tech Manager
CS Dealer Services
Posted By: equate
Date Posted: November 13, 2009 at 3:54 AM
wblakes wrote:
what i usually do is just use the Factory Disarm wire and send a pulse to the Unlock Wire to disarm it before remote start. that way i don't have to run a wire to the keysense wire.
Hi, Mike, thanks so much .
But I dont really understand this part. you use "Factory Disarm wire". is it from car side or alarm side?
"Unlock Wire", is it from car side or alarm side?
If you use factory disarm wire from alarm to trigger the car's disarm wire, I think it might unlock the vehicle.
Posted By: equate
Date Posted: November 13, 2009 at 4:29 AM
wblakes wrote:
The issue with doing it this way is the drivers door is unlocked during remote start....
all of the Directed products i've installed lock itself after the car starts. press the start button on the remote, driver's door unlock, car starts, driver's door lock. for other brands of remote starters, most of them have the option of sending a pulse signal after the car starts. if the remote starter have neither option, then the keysense wire has to be use.[/QUOTE]
How about Compustar? Does it lock itself after start?
Posted By: Mike M2
Date Posted: November 13, 2009 at 6:29 AM
equate wrote:
wblakes wrote:
what i usually do is just use the Factory Disarm wire and send a pulse to the Unlock Wire to disarm it before remote start. that way i don't have to run a wire to the keysense wire.
Hi, Mike, thanks so much .
But I dont really understand this part. you use "Factory Disarm wire". is it from car side or alarm side?
"Unlock Wire", is it from car side or alarm side?
If you use factory disarm wire from alarm to trigger the car's disarm wire, I think it might unlock the vehicle.
Well, yes and no. You can't ever make a blanket statement like this because every car is different. Disarm pulse on a Toyota will unlock the drivers door, yet a disarm pulse on a 2005 Malabu won't. Manufacturer's all design differently. Hey, if there was a simple answer anybody could do our jobs.... ------------- Mike M2
Tech Manager
CS Dealer Services
Posted By: equate
Date Posted: November 13, 2009 at 9:31 AM
Mike M2 wrote:
[QUOTE=equate][QUOTE=wblakes]
what i usually do is just use the Factory Disarm wire and send a
I look on the manual of idatalink. What is CANH and CANL? canbus? or something else? what does it do? to control door looks?trunk opens?etc?
Posted By: wblakes
Date Posted: November 13, 2009 at 3:36 PM
equate wrote:
I look on the manual of idatalink. What is CANH and CANL? canbus? or something else? what does it do? to control door looks?trunk opens?etc?
CAN-H and CAN-L are data wires that you would connect you data module to; can usually be found at the OBD port. if you are using a data module, it pretty much take care alot of the wires for you without having to run wires to different locations in the vehicle. what model of data module are you using?
Posted By: Mike M2
Date Posted: November 13, 2009 at 3:42 PM
equate wrote:
Mike M2 wrote:
[QUOTE=equate][QUOTE=wblakes]
what i usually do is just use the Factory Disarm wire and send a
I look on the manual of idatalink. What is CANH and CANL? canbus? or something else? what does it do? to control door looks?trunk opens?etc?
Can is a means of sending data. Think of it as the western days and some dude sitting in a railroad office using morse code. He is sending data thru a single wire to another guy a hundred miles away telling him something. Can would be similar as it sends a signal from say, the cars BCM to the radio(this is true in new American made cars). You turn on the key, the key sends a signal to the BCM, the BCM sends a signal to the radio letting it know to come on. When you use an Idata module, it takes a signal from the RS and sends it to the car to do many things. ------------- Mike M2
Tech Manager
CS Dealer Services
Posted By: equate
Date Posted: November 14, 2009 at 4:18 AM
I see...tks so much
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