Key Sense. What Does It Mean?
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=25891
Printed Date: July 13, 2025 at 12:15 AM
Topic: Key Sense. What Does It Mean?
Posted By: thepencil
Subject: Key Sense. What Does It Mean?
Date Posted: February 05, 2004 at 10:40 AM
This term is used on remote starter installation manual, but what does it mean? What exactly does it do?
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Be careful whose advice you buy, but be patient with those who supply it.;)
Replies:
Posted By: sroth140
Date Posted: February 05, 2004 at 11:01 AM
it knows when the key is in the ignition or not. i think passkey 3 might use it. i know a lot of 555u setups need to ground the key sense on RS activation, so they car thinks the key is in.
Posted By: bmf1000d
Date Posted: February 05, 2004 at 1:22 PM
Key sense if for when you have a transponder key and you use a coffin with another key. It shuts the coffin down and lets the key in the ignition work so that the car does not see 2 keys and shut down due to seeing 2 of them
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"Big" Mike
Double Take
Fremont, Ne
remember to check all your wires with a dmm not a test light!!
i take no responsibilty whatsoever for the vailidty of the info nor consequences thereof
Posted By: NowYaKnow
Date Posted: February 05, 2004 at 5:39 PM
As you see there are two common uses of the key sense wire. It would really depend if your unit has a key sense INPUT or a key sense OUTPUT.
If it's an input, as mentioned that usually means when the units see a key in the cylinder, it will shut down the bypass. Some units also use the input to make the quick stop feature work. Finally, some alarm systems will use the key sense as a trigger as well.
If it's an output, it's going to be sending a signal to the factory key sense wire to make the car think the key is in the ignition during remote start. Usually not necessary in most cases, but some cars are picky.
Hope that helps,
Mike
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