Factory alarm with aftermarket siren?
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=30184
Printed Date: July 15, 2025 at 5:53 AM
Topic: Factory alarm with aftermarket siren?
Posted By: DvMxDv
Subject: Factory alarm with aftermarket siren?
Date Posted: April 11, 2004 at 5:48 PM
Hi All, I curious if anyone knows if I can add an aftermarket siren to a factory Honda alarm? I'm wanting to add a battery backup siren in my center console wired to the factory alarm. I figure that if a thief uses the normal trick of breaking the window and pulling the alarm fuse, he'll be met with 130db of fun comming from deep inside the dash... Should be a fairly good theft deturant... What do you think? Does anyone make a harness that plugs into the factory alarm harness that will allow the addition of a siren? Thanks. Dave
Replies:
Posted By: CutDog504
Date Posted: April 12, 2004 at 2:08 AM
I think your best bet would be to get an add on alarm that you can use with your factory remotes. The way most of those work, is you wire them up so that they arm when you arm your factory alarm, and disarm when you disarm your factory alarm. That way, you can add your siren, a backup siren, even a glas mic and a shock sensor.Even a radar sensor if youd like, that way you alarm will chirp if someone just gets too close to it!
Posted By: DvMxDv
Date Posted: April 12, 2004 at 12:56 PM
Yeah, I've done the whole aftermarket alarm thing in the past and am just not willing to deal with a proper install and features. It's more than I really need. The flashing LED will warn off any of the opportunistic thieves who just want to smash and rummage. My idea about the battery back up siren is more for the guys who want to take my car to strip it like recently happened to my Integra. Those guys know how to steal a car and know that you just need to pull the right fuse to disable the factory alarm as well as the ways around aftermarket alarms. I want to integrate a battery siren into the power connection for the factory alarm so that if that fuse is pulled, there is a less than pleasant noise comming from inside the dash that can't be disabled. Makes the car much less attractive to a would-be thief and gives me time to load the old 12-guage... Are there any harness plug-in's like Metra kits that will allow me to tap into the factory alarm's power lead without cutting wires? Basically I want to be able to unplug any mod I make to the car and have it be in 100% stock condition when I sell. Thanks.
Posted By: zerocuwl
Date Posted: April 17, 2004 at 9:11 AM
I removed my factory horn an placed a cop siren in its place. Any siren would would as long as it is one tone not six or more. That would give your factory a siren sound to it. But becareful your car might have two horns, one for the car and one for the factory alarm. If so then you must search the engine compartment for the second one and either disable it or put the siren there. or even have two sirens. Even sounds pretty cool when someone cuts you off then you can just push your horn and youll get a siren instead.
Posted By: customsuburb
Date Posted: April 17, 2004 at 11:31 AM
You could try an air horn in your dash instead. My neighbor has one and damn its loud. I dont think i could do anything in a car with something that loud going off.
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