two modules, one tri color led?

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!

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.

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Kevin Pierson

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".

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

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

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Kevin Pierson

Forgive my figure of speech?

Time to get out the meter...