Adding Auto Lock and Unlock to Factory Alarm, 2008 Honda Civic
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=146011
Printed Date: May 03, 2025 at 10:34 PM
Topic: Adding Auto Lock and Unlock to Factory Alarm, 2008 Honda Civic
Posted By: marfo
Subject: Adding Auto Lock and Unlock to Factory Alarm, 2008 Honda Civic
Date Posted: February 10, 2020 at 6:27 PM
I have a Honda Civic mk8 2008 with the standard push start, factory fitted alarm and central locking system.Apparently, some models have this feature and some dont, and mine doesn't.Can I add a door lock and unlock feature so when I start the engine, the doors lock and when I stop the engine, the doors unlock ?
I did look at the articles on here and there was one showing how to do this on cars without an alarm but not with an alarm already fitted.
Replies:
Posted By: i am an idiot
Date Posted: February 10, 2020 at 6:49 PM
Diagrams 15 and 16 on this page
You can do this with an existing alarm. It says without, because if you had an aftermarket alarm you would be able to program this feature into the alarm.
Posted By: i am an idiot
Date Posted: February 10, 2020 at 6:50 PM
Power Lock green or blue - driver kick, door harness, white 18 pin plug, pin 16 Directwire
Power Unlock gray - driver kick, door harness, white 18 pin plug, pin 12
Posted By: marfo
Date Posted: February 10, 2020 at 7:53 PM
Ah, OK. I'm surprised I need 4 relays to do it though.What size relays would I need and am I right in saying that two of the relays show a built in diode?
Posted By: iskidoo
Date Posted: February 14, 2020 at 10:00 AM
Posted By: iskidoo
Date Posted: February 14, 2020 at 10:08 AM
Hook up the following wires from the 452T.
Red to constant +12 volts. (White)
Black to chassis ground.
Violet to ignition wire. (Blue)
Blue and Green to the lock/unlock wires
listed in previous post by “I am an idiot”
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Steve G
Posted By: iskidoo
Date Posted: February 14, 2020 at 10:16 AM
See them available for $7-$8 on eBay also.
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Steve G
Posted By: marfo
Date Posted: February 14, 2020 at 7:51 PM
Thanks for the help folks.That 452T is just the thing I need.I am in the UK and I cant find anyone selling them over here but I will ask some of my local Clifford alarm installers if they can get one for me.
Cheers.
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