horn output to 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=137526
Printed Date: April 28, 2024 at 9:11 PM
Topic: horn output to siren
Posted By: jdm99prelude
Subject: horn output to siren
Date Posted: October 25, 2014 at 7:00 AM
Can i use the horn (-) output with a relay to use a siren instead? 
Replies:
Posted By: howie ll
Date Posted: October 25, 2014 at 4:01 PM
Yes but place a 14004 diode across 85 and 86, band to 86 as a relay squelch, otherwise relay on shutdown will check 200 volts down your horn trigger wire, if transistor or chip driven you've fried it!
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: catback
Date Posted: October 25, 2014 at 5:23 PM
While that circuit is functional, I am of the opinion what you seek won't work.
Horn outputs are pulsing outputs, siren outputs on the other hand are constant. So while connecting the siren to the horn output will generate sound it won't function in the manner you would expect.
What unit do you have that needs a siren but doesn't have an output for one?
Posted By: i am an idiot
Date Posted: October 25, 2014 at 7:57 PM
I see you have found the relay section on this site. There is a diagram for Pulsed to steady, that in conjunction with the one you posted will give you a more suitable siren output.
Posted By: jdm99prelude
Date Posted: October 26, 2014 at 1:40 PM
Thanks for all the reply, but i can change the horn option in programing to siren 20ms... Can i not? Its a viper 4105v...it just dont have a wire for siren and i dont like horn.
Posted By: howie ll
Date Posted: October 26, 2014 at 1:46 PM
It won't sound right.
-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: i am an idiot
Date Posted: October 26, 2014 at 4:50 PM
I see you have found the relay section on this site. There is a diagram for Pulsed to steady, that in conjunction with the one you posted will give you a more suitable siren output.
Posted By: jdm99prelude
Date Posted: October 27, 2014 at 8:59 AM
 this the one u talking bout?
Posted By: catback
Date Posted: October 27, 2014 at 9:14 AM
That's not the one, you want the opposite - momentary to constant. Is there a purpose or reason for this exercise?
Posted By: howie ll
Date Posted: October 27, 2014 at 9:17 AM
No just for the OP to practice cutting and pasting, surely there's a POS siren output on that unit?
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: jdm99prelude
Date Posted: October 27, 2014 at 11:42 AM
Theres no siren output on the viper 4105v, and i wanna put a siren in. Dont want car horn.
Posted By: i am an idiot
Date Posted: October 27, 2014 at 1:37 PM
Posted By: catback
Date Posted: October 29, 2014 at 7:12 AM
The original diagram you posted will suffice because the 4105 isn't an alarm and probaly aren't seeking a loud siren going off during locking and unlocking - especially if you dislike the horn for these operations. The down side is one has to test the setup to determine if siren chirp will work properly with the horn output. If it does panic doesn't sound the siren but merely makes it chirp.
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