2002 Trailblazer - Add piezo

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=58679
Printed Date: May 30, 2024 at 1:15 PM

Topic: 2002 Trailblazer - Add piezo

Posted By: jizzajam
Subject: 2002 Trailblazer - Add piezo
Date Posted: July 01, 2005 at 11:58 AM

I'd like to add a piezo speaker to the inside of my car that will sound when the alarm is tripped. Is there a wire that goes high when the alarm goes off? or is it something that needs to be decoded from the Class-II bus?

Replies:

Posted By: Velocity Motors
Date Posted: July 01, 2005 at 12:10 PM

If the OEM alarm sounds the horn, you can add a relay that triggers the siren from the horn. Wire it so that the relay will turn off when the IGN is on so that it doesn't sound when the truck is running.

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

Posted By: jizzajam
Date Posted: July 01, 2005 at 12:46 PM

Thanks, thats a great suggestion. The only downfall is that the horn only sounds for 30 seconds and I'd like it to stay on for about 2 minutes. But you gave me a good idea, I'll make a circuit that stays open for 2 minutes after being triggered by the horn when the ignition is off. Does anyone think there is a more elegant (read: easier) way to accomplish this?

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