two modules, one tri color led?

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letitsnow

Member - Posts: 4

Joined: January 01, 2009

Location: New York, United States

Posted: January 01, 2009 at 7:01 PM / IP Logged

I'm installing a Viper 771XV alarm and 689M neutral safety module. Each has a status LED. The OEM security button in my car (which I intend to integrate into the alarm) has a status light built into it from the factory that is simply on or off.

I would like to replace the light in the OEM security button with a tri-color LED, used by the two DEI modules. My question is, how do I wire it? I'd run the positive from each module to each positive on the LED, but the common has to ground somewhere. Do I tie it to the pins on both modules, maybe with protective diodes? Do I use just one module? Should I just ground it to the car's chassis?

Any direction is appreciated!

KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: January 02, 2009 at 1:39 PM / IP Logged

It's been a while since I messed with a DEI LED output but I do believe they switch the (-) side of the LED, not the (+) side. This means you will need to find an LED that has a common + side and two seperate (-) inputs. Assuming both modules use the same voltage output you would tie the (+) pin to one of the outputs - it shouldn't matter which one.

You will also need to make sure there isn't any conflict with the LED if both outputs are on at the same time.

Kevin Pierson

letitsnow

Member - Posts: 4

Joined: January 01, 2009

Location: New York, United States

Posted: January 02, 2009 at 1:44 PM / IP Logged

This doesn't surprise me - why should anything be simple? Fortunately for me, my Subaru's entirely wired that way, so I'm familiar with having to work "backwards".

KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: January 02, 2009 at 1:54 PM / IP Logged

technically, since electrons flow from (-) to positive it is working "frontwards".

Most cars switch the ground for smaller things like lights and such.

Kevin Pierson

letitsnow

Member - Posts: 4

Joined: January 01, 2009

Location: New York, United States

Posted: January 02, 2009 at 2:09 PM / IP Logged

Forgive my figure of speech?

Time to get out the meter...

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two modules, one tri color led?

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