BMW factory fitted alarm siren

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big_stoo

Member - Posts: 4

Joined: May 26, 2004

Location: United Kingdom

Posted: May 26, 2004 at 10:55 AM / IP Logged

Hi there!

Im trying to change the alarm siren on my '96 BMW 323 coupe to something with more volume. My friend has given me his old siren from an aftermarket Honda system. Its a no-name battery backup siren but has a great sound...

Anyway, my BMW siren and harness has 4 wires - 2 red, 1 black and 1 black with heatshrink over it. The no-name siren has 4 wires - 1 red, 1 black, 1 purple, 1 blue. Purple and blue are the +/- trigger wires according to the back of the siren unit. it also has a black 'soft chirp' wire which has to be cut to be disabled if required.

So, any ideas on how to wire this up to the existing 4 wire harness under the bonnet? Has anyone done this before, or should I give up now before I break something?

big_stoo

Member - Posts: 4

Joined: May 26, 2004

Location: United Kingdom

Posted: May 29, 2004 at 8:30 AM / IP Logged

bump

BMW factory fitted alarm siren -- posted image.

Anyone got any experience with these cars? Its a factory fitted system as far as I know.

I just really need to know which wire goes where on the siren eg which of the two red wires is my power and which black wire is my ground etc, etc.

draasch

Gold - Posts: 2,172

Joined: February 07, 2003

Location: Florida, United States

Posted: May 30, 2004 at 8:49 PM / IP Logged

have you tried to use a meter on the wires??????

Good Luck

David

Ace Security

813-376-9778

Tampa

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big_stoo

Member - Posts: 4

Joined: May 26, 2004

Location: United Kingdom

Posted: May 31, 2004 at 2:50 AM / IP Logged

I can borrow a meter to try, but i'm not sure what voltages to look for etc. I tried searching through the forum but Im still unsure, although Im OK with basic electrics. Thanks.

big_stoo

Member - Posts: 4

Joined: May 26, 2004

Location: United Kingdom

Posted: May 31, 2004 at 2:53 AM / IP Logged

What puzzles me is the fact that there are 4 wires to the existing siren. I thought that usually a battery backed siren only has 3 (power, ground and 1 trigger).

jimmeezgolfvr6

Silver - Posts: 258

Joined: March 10, 2002

Location: Canada

Posted: May 31, 2004 at 3:25 AM / IP Logged

actually, most backup battery sirens have 4.....you can choose to trigger it with either a positive or negative trigger. just a convenience feature. some older clifford backup sirens have 4 wires also, with the intention of connecting the 4th wire to ignition so that it charges up only when the ignition is on.

ultimately, on your factory siren, the wire you really need to find is the trigger. constant +12v and ground you can always get from elsewhere. of course, it would be so much more convenient if you can find those amongst those 4 wires also.

good luck!

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BMW factory fitted alarm siren

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