having horn blow when siren is goig off
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=1717
Printed Date: May 05, 2024 at 5:55 AM
Topic: having horn blow when siren is goig off
Posted By: INTREPID
Subject: having horn blow when siren is goig off
Date Posted: July 05, 2002 at 1:37 PM
Im trying to make my horn blow when my siren is going off(both at the same time) does anyone have a diagrm or knows how to do it. I have a viper 300+ thanks
Replies:
Posted By: 2000vsm
Date Posted: July 05, 2002 at 1:40 PM
that's easy, just hook up the ground wire from alarm when armed to one side of a relay coil then the other side coil from the siren output +. then connect the common to ground and N/O to the horn (of course if your horn is +, then connect common to 12v) now the problem is that everytime you arm your car, it will chirp the horn and everything else.. which is crap in my opinion... i want to do this but i only want the horn going off when the alarm goes off.... hard eh?
Posted By: INTREPID
Date Posted: July 05, 2002 at 1:44 PM
thats the same thing i want for it to only blow when the alarm is triggered! i've heard cars with this i just need to know how to wire it up
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Posted By: eduzerve
Date Posted: July 05, 2002 at 3:03 PM
2000vsm I too want my alarm to blow the horn instead of the siren, to give it a factory appearance. Problem is that I want the alarm to chirp when I activate it and desactivate it, not to blow the horn... do you know how to do this? or anyone else? Thanks Eduardo
Posted By: mobiletoys2002
Date Posted: July 05, 2002 at 5:55 PM
i posted before if you turn the chirps off on your alarm it will only go off when you the alarm is triggered. and it will also go off when the alarm is in warn away but it will not chirp when you arm and disarm. If you have seen cars like this they probably had their chirps off as well because as far as i know i have never heard of any other way of doing this.does it matter if the horn goes off when someone bumps your car??? would'nt you want that? 
Posted By: 2000vsm
Date Posted: July 07, 2002 at 12:16 AM
no we want like just regular "chirp chirp" for arming and crap.. but only HONK when triggered... just like some alarms have this feature... i don't think it's super controlled by a microprocessor to do something so simple so i think a relay can be done.. we just need to know how? like maybe that one relay activates another ONLY if like the trigger from hood/trunk/door/sensors (what else other than those?) will turn on the second relay therefore making the horn honk as the siren goes off... does anyone know how to create a PULSED output? like chipr, chipr, chirp chirp etc.. like the turn signals, how the hell does that work?
Posted By: mobiletoys2002
Date Posted: July 07, 2002 at 1:02 AM
Heres how a flasher works ie(turn signals)which you can use a flasher to honk your horn but if you have a negative trigger you will have to wire it so that the flasher has a way to complete the circuit.read the kink to undersatnd better https://howstuffworks.com/turn-signal2.htm \\\\\\\\
Posted By: Thinkster
Date Posted: July 08, 2002 at 3:25 AM
I think that cars that you've heard where this works how you want it have an alarm that has a seperate output just for horn use that is controlled by the microprocessor in the alarm. The manufacturer can program that output however they want (to chirp or not to chirp when arming/disarming). Unfortunately we can not change that program in the microprocessor, so the only way I can see doing this if the alarm doesn't have the dedicated horn output feature is either modifying the electronics and adding some logic chips & transistors or building the logic out of multiple relays and possibly a flasher. To do this, I need to know if there is a unique condition that is only present when the alarm is triggered (like this output is on and this output is on) This condition can not be present when arming or disarming or while in valet, etc.
Posted By: 2000vsm
Date Posted: July 08, 2002 at 9:23 AM
so the firmwarm cannot be updated or changed? that sucks, can't we tap into the microprocessor and change the subroutines? or yet make a new one?
Posted By: Thinkster
Date Posted: July 09, 2002 at 2:45 AM
I suppose if you were a hacker you could probably re-write the firmware but usually the program lies within a OTP (one time programable) Microprocessor. It would be possible with a "blank" chip, but a big hassle!
Posted By: cpgoose
Date Posted: August 13, 2002 at 6:58 AM
Did you guys ever figure out how to do this? Just want to make sure...if you hook it up to a relay as in the beginning post, and you turn
off your arm/disarm chirp...the horn will only honk when the alarm is fully triggered, or in warn-away? Will it honk honk honk?....or will it hooooooooooooonk as a constant blare? (Again, thought I'd ask before I do)
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