compustar 2w900fm s horn output

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=97309
Printed Date: July 13, 2025 at 9:32 AM

Topic: compustar 2w900fm s horn output

Posted By: 1995s-14
Subject: compustar 2w900fm s horn output
Date Posted: September 20, 2007 at 8:16 PM

i cant get an output from the horn to work. i test it with my voltometer and set at DC 250mA it reads around 1.2. Is that enough to activate the horn? maybe is the brain bad?

Replies:

Posted By: chadwa2003
Date Posted: September 20, 2007 at 8:26 PM

You need to test for resistance to ground and i've never seen a horn output blown on these systems.

Posted By: Velocity Motors
Date Posted: September 20, 2007 at 8:36 PM

The horn output is a low level to trigger a relay. Use a relay and it will work.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Posted By: JWorm
Date Posted: September 20, 2007 at 10:21 PM

I think by default it only pulses the horn if you "panic" the system. If you want it to honk when you lock and unlock you will need to change one of the programmable settings.

Posted By: 1995s-14
Date Posted: September 20, 2007 at 11:52 PM

how do you do that

Posted By: 1995s-14
Date Posted: September 21, 2007 at 4:55 PM

no the honking setting is on

Posted By: Velocity Motors
Date Posted: September 21, 2007 at 6:44 PM

Use this link for a (-) trigger to negative horn honk wire

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

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