horn issue

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=111472
Printed Date: May 15, 2025 at 8:23 AM

Topic: horn issue

Posted By: bearcub48625
Subject: horn issue
Date Posted: February 10, 2009 at 1:12 PM

i have a 03 explorer with a code systems ca521 remote start with keyless and it does not have a horn output on the unit, it does have a 300ma ground output that i could use, but the horn is just way to loud when i use that wire. i've been told i can fix this with a resistor, but what kind of resistance value would i need to make it have the volume of lets say a factory keyless chirp?

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JEREMY

Replies:

Posted By: Big Dog
Date Posted: February 10, 2009 at 1:28 PM

Use this to shorten a long pulse: RELAY

Use the first diagram.

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Prepare your future. It wasn't the lack of stones that killed the stone age.

Posted By: wiringfool
Date Posted: February 10, 2009 at 11:14 PM

boy iam sure glad i looked at this issue cause iam gonna use this relay config to lower the entrance alarm at my shop thanks

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wiringfool eieioztztzt

Posted By: bearcub48625
Date Posted: February 11, 2009 at 8:04 AM

if i don't have a positive pulse wire, is there another way or should i just reverse the polarity of the pulse with a relay

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JEREMY

Posted By: Big Dog
Date Posted: February 11, 2009 at 8:22 AM

In that case do all these steps:

1) Inverse the diode

2) Inverse the cap

3) Change the ground from where the cap and resitor meet and put it to a fused 12V+.

The trigger stays on the same wire but will now work in opposite polarity.

Also, if your horn trigger requires a negative activation then change the polarity of pin 87 to ground.

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Prepare your future. It wasn't the lack of stones that killed the stone age.

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