how to power a piezo from a sl500 benz

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labreejr

Member - Posts: 3

Joined: November 17, 2008

Location: Illinois, United States

Posted: November 17, 2008 at 12:17 PM / IP Logged

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.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: November 17, 2008 at 12:30 PM / IP Logged

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.

KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: November 17, 2008 at 5:20 PM / IP Logged

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

Kevin Pierson

labreejr

Member - Posts: 3

Joined: November 17, 2008

Location: Illinois, United States

Posted: November 18, 2008 at 12:48 AM / IP Logged

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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how to power a piezo from a sl500 benz

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