i have a nissan 100nx 2 litre (nx2000 in the usa and australia i think) and i've been banging my head trying to work out a latching circuit that will allow me to put the windows up after stopping the engine until i open the door. and also a simple diagram for a push button start. i've done all the searches i can think of on the site and drawn a blank can anybody help?
How are your windows wired? 3 wire? 5 wire? Switching?
Most likely this is what you will need...... howevwer the Radio's accesory wire would not be for the radio...... It would go to the windows instead, the windows will have power available to them until the door is opened.

get a push button with two wires off the back of it put one wire to 12volts the other to your starter wire... simple & works
Wouldn't it be better if he used a relay in that push button scenario? You would have to splice your starter wire (in the steering column harness) and connect as follows:
85: ground
86: +12 volts (fused)
87a: open
87: one end of the starter wire
30: other end of the starter wire
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The search function is your friend.
I think all he's trying to do is a General Motors-Type accessory where the radio and power windows stay on after the key is removed, and until the door is open. This is the circuit right on this website (retained accessory power). Just make sure you tie into the main accessory off the ignition harness because the one behind the radio will not be able to carry enough current for the power window circuit.
https://www.the12volt.com/relays/page5.asp
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Seth Alvo NY
Mobile Electronics Installer
If you make a internet search for Push button Starter you will find that there is already available several models and the instalation is very easy.
Isaac
