how to power a piezo from a sl500 benz

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=108987
Printed Date: June 20, 2025 at 8:19 PM

Topic: how to power a piezo from a sl500 benz

Posted By: labreejr
Subject: how to power a piezo from a sl500 benz
Date Posted: November 17, 2008 at 12:17 PM

I've got this high pitched siren I want to use in my project 84 Cutlass. It comes from a 2004 Mercedes SL500, factory alarm system. It has 3 wires coming from it, brown, RED / yellow, black yellow. I've tried every wire combo to to get a sound out of it and got nothing. A friend told me I need to knoe the polarity. Any ideas will be appreciated.

Replies:

Posted By: howie ll
Date Posted: November 17, 2008 at 12:30 PM

Brown is ground, RED / yellow is 12v+, black yellow is the trigger, try grounding the black yellow, then pos, unfortunately it might be a data lead thus you are stuffed, therefore chuck it.

Posted By: KPierson
Date Posted: November 17, 2008 at 5:20 PM

You may want to try driving one of the pins with a frequency - thats how the Honda piezos are.

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Kevin Pierson

Posted By: labreejr
Date Posted: November 18, 2008 at 12:48 AM

Ok. Grounding the BLACK / YELLOW didnt work. How do I drive the pin with a frequency? I believe there is an internal battery, it has Ni-Mih(I think thats is) on the back.

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