I want to hook up my computer in my g35 to the alarms arm feature so that when the car is disarmed (unlock button pressed), power will be supplied to my computer and it will turn on. I'm using an OPUS power supply and will throw a relay in to get the proper positive line.

All I need to know is where is the alarm located or a power line that becomes active when the alarm is armed and nonactive when its not armed?

I was going to just tap into the power line for the alarm light, but that has a funky power signal that gets flashed on and off depending on the state of the car.

A wiring diagram of the alarm would also be greatly appreciated.

 

WARNING: Answering his question may result in alot more G35's being stolen.

'04 G coupe TB Graph 5A (all options except NAV and SAT).
No Mods.....yet

"Hello Everybody...My name is Black and I am a G-oholic."

 

I ended up downloading the service manual from nissan-techinfo.com from what I can tell there doesnt seem to be an individual alarm. It seems everything is integrated into the BCM I also can't find anywhere where a constant power line indicating whether the alarm is armed or disarmed coming from any of the devices in the car or going into any of the 70+ lines feeding the BCM. I assumed this state is kept internally by the car's computers and never communicated as a constant power supply to drive any other device.

At this point I am just going to convert the flashing power supply for the alarm led at the top of the center console to a constant 12v power supply using a capacitor. Heres a mp3car.com thread I started discussing the circuit:
http://www.mp3car.com/vbulletin/showthread.php?t=22983

 

Have you considered tapping into the power door lock actuator?

Best of luck!


BLKSNAKE - '04 G35 Coupe
Check out my hidden sub! [img]/w3timages/icons/laugh.gif[/img]

 

Yeah, that was discussed on MP3car forum, the problem is that the computer will then go off if I lock the doors while in the car and the actuator is only 5 volts so I'll still have to convert it to 12volts with a relay or something. The more I think about it though, the more I like this idea so I still may end up doing it this way or tying into the light that goes on around the keyhole and then putting a diode on and combining the positive feed with the ACC line. This will result in the computer starting when its intially unlocked, but only going off if its locked and the key is out.

 

The actual acutator output from the BCM is a reverse polarity 12 volt signal. You could use this signal in conjuntion with an ignition voltage to make a relay logic switch (only turns on/off when the ignition is off).

Kevin
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04 Diamond Graphite Coupe - FULLY loaded
Windows up with OEM Remote