rfid central locking.

That looks like it. 

And this version would work with a Negative Pulse just like a standard car alarm yes? Also you never responded about durations of the pulse. Is it possible to alter it by changing the Capacitor or Resistor? Thanks Ben

Sorry I didn't see the question about the pulse length. Yes changing the capacitor will shorten or lengthen the pulse. 1000 mic around 1/2 second. 470 mic should be 1/4 second. 2200 mic 2 seconds. That is all theory, you may have to experiment. The only purpose of the resistor is to drain the cap and get it ready for the next cycle, changing the resistor will do nothing for the pulse length. Your latest diagram, as is the first one is exactly what you need for the situation you described.