Stereo on until door opens question

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=21485
Printed Date: May 15, 2025 at 2:27 AM

Topic: Stereo on until door opens question

Posted By: fastev
Subject: Stereo on until door opens question
Date Posted: November 14, 2003 at 11:32 PM

I am trying to set my stereo up to continue playing until I open my door using the diagram shown on this website. My problem is, what type of switch do I use to activate the system? I figured I would use a momentary switch that is held closed when the door is closed. Will this work if I attach one wire to the relay and the other to a chassis ground?

Replies:

Posted By: auex
Date Posted: November 15, 2003 at 10:03 AM

It works automatically, you don't need any type of switch. When you put the key in the relay turns on and that turns the radio on. The relay stays energized until you open the door. How well do you know relays? If you need I will describe this more in depth. Just in case here is the diagram.
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Posted By: defective
Date Posted: November 15, 2003 at 10:58 AM

just remeber, if you remote start then quit or timeout, the radio will still be on....grin

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Posted By: the12volt
Date Posted: November 15, 2003 at 12:04 PM

If you use it with a remote starter, add another relay triggered by the remote starter's sensor bypass output to interrupt ground going to the right relay shown above. This will prevent the latch (left relay) from engaging while the vehicle is running by remote start.

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Posted By: fastev
Date Posted: November 15, 2003 at 2:54 PM

Auex, thank you for the response. What is the door trigger lead in that diagram ? I thought there needed to be a switch there, I guess not though. Perhaps you could describe the system in a little more detail for me...? Thanks!!
--Evan

Posted By: auex
Date Posted: November 15, 2003 at 3:12 PM

The door trigger is the wire that tells the car that the door is open. What basically happens is once you put the key in the ignition, the relay's will energize sending power to the radio. This will stay energized until you take the key out and open the door. On the relay to the right, the power that is supplying the radio power is also supplying the trigger that keeps the radio on. the relay on the left will take away the ground to the trigger when the door is open, thus resetting the relays and turning off the radio.

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Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.

Posted By: fastev
Date Posted: November 15, 2003 at 9:56 PM

That makes more sense to me now. So can I use the wire that goes to the dome light? That would effectively act as the trigger, correct? If not, could you suggest one that would work? I can't find any contact, button, or switch on my truck that I would be able to use. (2002 Ford Ranger Edge, 4-door) Thanks again!

--Evan

Posted By: fastev
Date Posted: November 16, 2003 at 12:41 AM

I found a wire that is labeled as "Door Trigger". Is this the wire i should tap into? The polarity is negative if this matters...

--Evan

Posted By: auex
Date Posted: November 16, 2003 at 8:56 AM

Yeah, it needs to be (-) trigger to shut the relays off. What kind of car do you have, make, model, year?

-------------
Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.

Posted By: fastev
Date Posted: November 16, 2003 at 10:43 AM

The trigger wire is negative, right behind the stereo. I have a 2002 Ford Ranger. The wiring colors chart for my truck can be found here: https://www.generation-edge.com/forums/topic.asp?TOPIC_ID=4431 via generation-edge.com. It has a wire labeled Door Trigger, you can find it about half way down the list. Thank you again for all the help!

--Evan

Posted By: fastev
Date Posted: November 16, 2003 at 11:09 PM

Thanks everyone for the help. I got it working. I has to tap into a trigger wire for the driver door. There is a seperate one for the passenger door. If i were to solder a wire into the trigger to the relay, (a "Y"), could I tap into the passenger door wire too or would I have to install a diode to prevent the current from one wire affecting the other? I don't think I explained that too well, so I apologize. If you could make out my giberrish and have any suggestions... Thanks!

--Evan