turn off headunit with alarm
Printed From: the12volt.com
Forum Name: Vehicle Wiring Information & File Requests
Forum Discription: Request Car Alarm, Car Stereo, Cruise Control, Remote Starter, Navigation, Mobile Video, and Other Vehicle Specific Wiring Info, Manuals, Tech Tips
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=136560
Printed Date: May 14, 2024 at 2:51 PM
Topic: turn off headunit with alarm
Posted By: mr signal
Subject: turn off headunit with alarm
Date Posted: May 04, 2014 at 12:20 PM
Hi,is there a way of connection your alarm to your headunit in order if you arm your alarm your headunit will turn of?I just want to know if it can be done and how as I can't find anything online.thanks
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Mr signal
Replies:
Posted By: i am an idiot
Date Posted: May 04, 2014 at 12:43 PM
After a remote start event?
Posted By: mr signal
Date Posted: May 04, 2014 at 1:25 PM
No remote start,I want the headunit to switch off when your arm/lock the vehicle.can it be done
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Mr signal
Posted By: i am an idiot
Date Posted: May 04, 2014 at 3:21 PM
Does your radio stay on after you turn off the key?
Your alarm does have an output that grounds when the alarm is armed. The only problem is that you would have to use this wire to trigger a relay. The 160 milliamp of current draw to keep the relay energized will run your battery down if you do not drive the car everyday.
Posted By: howie ll
Date Posted: May 04, 2014 at 3:51 PM
If it's a factory unit it should shut down on door lock. We need specifics, OEM or what brand aftermarket?
Also of course make model and year of vehicle.
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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: mr signal
Date Posted: May 05, 2014 at 12:45 AM
It is a aftermarket sony headunit.vw golf 1996 mk1..446rli autowatch alarm
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Mr signal
Posted By: howie ll
Date Posted: May 05, 2014 at 12:52 AM
A 96 Golf is a Mkll.
Mkl went to about 85.If it is a Mklll you've wired the stereo wrong.
A Mkll should have a thin brown red as your ACC.
Goes to red. The Red feed goes to your yellow.
If it is a Mk1 Mr.Idiot's relay comments apply because there's no ACC with either a Mkl or a Mk11 and you've no option but to turn off the radio or remove the fascia.
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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: mr signal
Date Posted: May 05, 2014 at 1:12 AM
The headunit is wired up correctly.it works.so my question ends up unanswered?so there's noway it can be done?
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Mr signal
Posted By: howie ll
Date Posted: May 05, 2014 at 1:18 AM
It can't be correct if it doesn't turn off with ignition and you have a 96 Mkll.
If it does turn off with ignition, why post the original question?
End of.
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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: mr signal
Date Posted: May 05, 2014 at 1:29 AM
Yellow and red is together..headunit is on when switching ignition off,that's what I want.reason for the Question is,I saw a few quys leaving their sound on,and when they get out and arm their car the alarm arms,windows goes up and and headunit goes off.I think that is fatory but I was just wondering if it can be done like that on aftermarket.I know how to switch my hu off and I know how to connect it to switch off with ignition..I was just wondering if there is a trick of doing it like in my Question..
Kin regards
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Mr signal
Posted By: howie ll
Date Posted: May 05, 2014 at 1:32 AM
No trick, just separate your Sony red and yellow as explained above yours ONCE AGAIN isn't wired correctly.
Ref. window and roof close. If it's possible extend your lock wire from the alarm to about 15 seconds that will give you window and roof (if factory)close.
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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: the12volt
Date Posted: May 05, 2014 at 8:54 AM
You could use the unlock output from your alarm to supply power to your head unit's red wire and the lock output from your alarm to kill power using the following relay setup.
 -------------  the12volt • Support the12volt.com
Posted By: i am an idiot
Date Posted: May 05, 2014 at 11:30 AM
He will have to pulse that setup with (-) to turn it on.
Maybe the Retained Accessory relay setup can be used instead.
Posted By: mr signal
Date Posted: May 05, 2014 at 1:33 PM
Hi.I connected it like you have it in pic with the 3relays.the headunit only lights when disarming for one second and dies again,1st and 2nd relay clicks when disarming.it doesn't stay on inorder to shut off when you arm.relay 3 doesn't click at all.I changed relays but still no luck.lock/green wire is connected as turn of and.blue/unlock is connected as turn on
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Mr signal
Posted By: mr signal
Date Posted: May 05, 2014 at 2:38 PM
Appologies guys,I got it right it was a wire problem.thanks to the guy with the diagram it worked perfectly.thumbs up to this site wow
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Mr signal
Posted By: i am an idiot
Date Posted: May 05, 2014 at 4:57 PM
I guess it helps if I do not just look at the pictures.
Posted By: howie ll
Date Posted: May 05, 2014 at 4:59 PM
Or none of the above Craig if the radio was wired correctly in the first place.
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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.
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