Horn Honk only when alarm is triggered?
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=22715
Printed Date: July 06, 2025 at 10:57 AM
Topic: Horn Honk only when alarm is triggered?
Posted By: cctyler
Subject: Horn Honk only when alarm is triggered?
Date Posted: December 11, 2003 at 6:28 PM
My Code Alarm Tw-1 has the siren and horn hooked up. IThe shop connected a relay to the parking light flash. The problem is, my acura has a wimpy "duck like" sound to the horn and its annoying because when the siren arms, disarms, starts, it chirps, the lights flash, the horn honks.
Is there anyway to just have the horn honk when the system is tripped and blaring? IF so, this could ideally be used for my peizo's as well and an extra siren, because I dont need these to chirp when I arm the system or start the car. So I need to somehow have a relay sense a constant output to the siren and give off a flash for the horn, but a constant for the peizo's..... Any ideas, Thanks Tyer
Replies:
Posted By: ck auto
Date Posted: December 11, 2003 at 6:35 PM
hi if you hook up a signal light flasher this will delay the siren but you won't get a constant output i used this to hook up air horns to my alarm definetly attention getting not like everyone elses.
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good luck
kirk
Posted By: cctyler
Date Posted: December 11, 2003 at 6:47 PM
I can see the light flasher on the air horns being a good idea. But what do I use so that the flasher can sense that the alarm is triggered and not just 'chirping' through arm/disarm?
Posted By: ck auto
Date Posted: December 11, 2003 at 7:35 PM
hi it takes a while for the flasher to charge. you won't get any chirps for at least 2 chirps my alarm was 3 chirps before airhorns would sound.
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good luck
kirk
Posted By: cctyler
Date Posted: December 11, 2003 at 7:39 PM
So I only need a light flasher? Or a relay from the siren output to the light flasher? How many amps can the a normal flasher handle? Thanks.
Posted By: ck auto
Date Posted: December 11, 2003 at 8:29 PM
hi you would have to check but i think they can esily take 10 amps it would say on the flasher or the pacakge. ------------- good luck
kirk
Posted By: HamiltonAudio
Date Posted: December 14, 2003 at 1:44 PM
an interesting quandry....we have ground outputs, and trigger outputs....but not an output when triggered only. What about using the siren output, splitting it with diodes, so you have essentially two outputs. One goes to the siren per normal...the other to be run through a simple time delay circuit of say 3 seconds. This way, the horn/air horns don't get powered up until there is a signal on the siren lead for 3 continuous seconds....simple chirping for arm/disarm wouldn't be long enough, so they wouldn't power up. I like the airhorn idea, only on trigger...very attention getting!! b
Posted By: NowYaKnow
Date Posted: December 14, 2003 at 3:11 PM
Here's what I can come up with..Have a relay like so:
85 - To the (-) ground out when armed wire
86 - To the (+) door trigger wire
30 - To ground
87 - To the horn wire in the car
This way the only way your horn will sound is if the alarm is armed AND the door is open. (Alarm armed + door open = the alarm is going off/being triggered, and so is the horn). Only drawback to this is that the horn would not be pulsing or anything, it would just be on steady. Would be easy to add another relay to the setup if you'd like the horn to pulse instead of be on steady. Also if your unit has a horn output then you could connect this to pin 30 on the relay instead of ground and it would probably pulse or do whatever the unit has that output doing. I haven't done many TW1's and definately not any lately so I really don't remember what all outputs it has..Hope that helps,
Mike
Posted By: CutDog504
Date Posted: December 15, 2003 at 8:50 PM
I have a setup on my car that powers 4 sirens, AND honks the factory horn and it only honks the horn when triggered. I accomplished thid with two relays and a two prong common turn signal flasher (which can be bought from autozone for under 2$) But I've since stepped up to an electronic flasher(about 8$)this results in a more consistent and even honking of the horn. If yer interested, i can explain how to wire them up. I think is what you need, only drawback is: that yer piezos will still chirp during arm, disarm, and remote start. But the horn will only honk during full trigger. It wont even start honking until the siren have been wailing for at least 3 seconds.
Posted By: cctyler
Date Posted: December 15, 2003 at 10:17 PM
CutDog504, please explain how to wire this up. Why would the pieoz's chirp during arm/disarm? Its not a big deal, but is there a way around it? I have an armed output, what if I hooked it up like this, 85 from armed output
86 to flashing parking lights (diode isolated)
87 to ground
30 to horn output The question is, does the armed output turn off before the pulse of the lights during arm/disarm. I still want to see how you did yours though. Im not great with relays, but this stuff is interesting, so please do tell!!! Thanks.
Posted By: sroth140
Date Posted: December 16, 2003 at 12:27 AM
timer relay could work too, i considered it for using peizos on the siren output, but i didnt want them to chirp on arm/disarm.
Posted By: CutDog504
Date Posted: December 16, 2003 at 9:58 AM
OK, I'll try my best to explain this. The first relay, you wanna wire as follows:
86---the (+) siren output wire from alarm brain
85---ground
87---+12v fused (at least a 14 guage wire
87a---not used
30---positive out to ALL sirens (including piezos) AND a jumper wire to 86 on relay#2
The second relay as follows:
86---jumpered to 30 on the 1st relay
85---ground(can also be jumpered along with 86 on relay1)
87---+12v fused (at least 14gauge) can be jumpered to 87
on relay number 1
87a---not used
30----output to terminal "x" on the two prong flasher
The two prong turn signal flasher as follows:
X---connect to terminal 30 on the second relay
L--connect to the (+)positive horn wire in the vehicle (usually after the horn relay, or under the hood near the horn itself) On most GM cars its a thick 14ga wire under the hood in the same harness as the headlight wiring
Posted By: cctyler
Date Posted: December 16, 2003 at 12:54 PM
Thanks CutDog, it makes sense how you wired it, but wouldn't all the sirens and horn still chirp on arm and disarm?
Posted By: cctyler
Date Posted: December 16, 2003 at 12:59 PM
In theory, could I also just hook your your relays to the armed output instead of the siren output?
Posted By: Steve #1
Date Posted: December 16, 2003 at 3:03 PM
I was in a similar situation recently and here is what I did.
I have air horns hooked up to my factory horns so I didn't want them honking all the time. The way it works, the horns only honk if the doors are open and the alarm is going off. If your vehicle has delayed curtisy lights, this may not work to prevent a honk on arming. The major side benifit of this set up is that if you hear your alarm AND the horn is honking, you know your vehicle has been opened and it isn't just a false alarm.
Here's how I did it (i have (+) interior lights and (-) horn trigger. If your vehicle is different then make the appropriate changes but this will give you the idea.
Relay one creates a negative pulse
86 - Ground
85 - parking light output from alarm (+)
87 - to 30 of relay 2
87a - not used
30 - Ground
Relay two
86 - (-) siren output from alarm
85 - (+) from door switch
87 - vehicle horn trigger
87a - not used
30 - 87 of relay 1
Note: you may need to add a diode to the siren wire. When I first hooked mine up I got a faint tone out of the siren when the doors were shut.
Posted By: Steve #1
Date Posted: December 16, 2003 at 3:03 PM
I was in a similar situation recently and here is what I did.
I have air horns hooked up to my factory horns so I didn't want them honking all the time. The way it works, the horns only honk if the doors are open and the alarm is going off. If your vehicle has delayed courtesy lights, this may not work to prevent a honk on arming. The major side benefit of this set up is that if you hear your alarm AND the horn is honking, you know your vehicle has been opened and it isn't just a false alarm.
Here's how I did it (i have (+) interior lights and (-) horn trigger. If your vehicle is different then make the appropriate changes but this will give you the idea.
Relay one creates a negative pulse
86 - Ground
85 - parking light output from alarm (+)
87 - to 30 of relay 2
87a - not used
30 - Ground
Relay two
86 - (-) siren output from alarm
85 - (+) from door switch
87 - vehicle horn trigger
87a - not used
30 - 87 of relay 1
Note: you may need to add a diode to the siren wire. When I first hooked mine up I got a faint tone out of the siren when the doors were shut.
Posted By: CutDog504
Date Posted: December 16, 2003 at 8:45 PM
No, the setup will only work when triggered by the siren wire. If triggered with the ground when armed output, it would cause the sirens to sound as soon as you armed the alarm. But you only want them to chirp when you arm it, and not sound until the alarm is triggered. So the way I have explained works perfectly. As for the horn, I initially thought that it would give a slight honk upon arming and disarming, but thats not the case. For some reason the flasher doesnt supply the horn with any volatage unless it is supplied with constant voltage. One chirp (or even several chirps in a row) is not enough to get the flasher to start flashing(honking, in this case). But the reson I ended up using two relays is as follows: When I first wired up this setup, I had the horn tied to the same relay as the sirens(relay #1) and when I pressed the horn while driving in traffic, there was feedback and the sirens would sound along with the horn. I tried a diode, but the horn used too much current. So I figured out this way with the first relay triggering a second relay, and then the second relay triggering the flasher. I've had this setup on my car for almost 5 years now with no problems, besides for the fact that about 2 years ago, the flasher started honking the horn errattically(one honk was a 1/2 second, then the next was a full second). I swapped it out, but this time putting in an electronic flasher(a bit more expensive, but more reliable). It has worked fine ever since. And to top it all off, this whole relay setup is mounted under my hood! Because thats where all my connection were to be made, thats where I put the relays. It is monted on the upper wheelwell near the sirens yet close to the horn wiring And the battery(for a +12v source) I have it wrapped in a lil bundle with 3m electrical tape, so it's basically waterproof.
Posted By: cctyler
Date Posted: December 17, 2003 at 1:52 AM
Thanks CutDog, about this electronic flasher. Whats different about it and is it any harder to find at an automotive store? Thanks again.
Posted By: cableguy13011
Date Posted: December 17, 2003 at 6:35 PM
hey listen up you have the programming in the menu all wrong enter the setup turn on the ignition press the valet swicth three times you going to hear a confirming tone once you here that turn off the ign then turn it back on you are going to her another confiming tone now you are in programing mode press the valet button five times you going to here the siren chirp six times then press the lock button on the remote till you hear the siren chirp once ok let me know i gave this to because you need it
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Cableguy!!!
Posted By: cctyler
Date Posted: December 18, 2003 at 1:45 AM
Cablebuy, what you suggested is the default setting of 100ms siren output. I haven't tried to change it, the other options are Horn 10ms, 15m, and 20ms..since there is no horn ouput on the TW1 will the horn settings just send a short pulse to the siren that does not allow it to chirp? Right now it works fine with the siren chirp, I would just like to get it so that the horns, piezo's, extra sirens are activated with the alarm is triggered. I still do not get way the armed output wouldn't work if it is used for the starter kill as well?
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