Alarm system ready LED

I would like to install a Green LED for my APS 785 alarm. The LED would be turned on when all doors, trunk and hood are closed. This would also serve as a door, hood, or trunk open while driving. It would also inhibit the alarm from being turned on until system is ready. Anyone have a simple method to share?

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You can just get a bunch of diodes, wire all the anodes together to your LED circuit, and use the cathode (striped) side of the diodes to go to your pin switches.
If any one of the switches go to ground, your LED will get a ground and light up.

Doesn't your alarm already have provisions for handling arming when a door is open, either by bypassing the zone or giving you some other kind of indication?

Oops, reread your post- if you want it to light up when the doors are closed rather than open, then you can get an inverter such as a transistor to reverse the action.

You could possibly reverse the diodes and have the LED powered through the diodes when a door is open, but you'd need to check if the LED's current draw from your door switch circuit will allow that. It'd be safer to use an inverter circuit, to make sure you don't affect any of your triggers.

I'd think it'd be better to use a Red LED to indicate that something is open, rather than the green one to indicate everything is closed. That also has the added benefit of less standby current draw during normal conditions, when the car is parked.

I agree with your Red vs. Green on power draw. Maybe I should consider powering the Green LED with the key switch. I was hoping that I could use the shock/proxy sensor 12V to turn on the Green LED. I am not sure if all doors etc must be closed, before the shock/proxy sensor is activated. Anyone know?

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Knowledge is Indisputable, Opinions are Subjective.