i need help with the 555u immobilizer

i have a starter kill relay where does the purple wire from the remote start

go

If you have a starter kill relay, then the Purple wire will have to hook up to the starter side not the key side. It will not start if you hook up the key side.  By the way, if the BLACK / YELLOW wire on the vehicle does not have true ignition then the vehicle will not start.  True Ignition will stay on when you try to turn the starter over.  Ignition or Accessory wire will goes off when you turn the starter over.  You will have to double check all your wiring connection.  Sound like you have the 555U hook up correctly. 

BLACK / YELLOW is True Ignition, BLACK/ Red is Second Ignition, and WHITE/ Red is Accessory.  Double check  on those connections.  You made have one of those wire hook up backward.  Have fun