aga 1201 remote start 98 altima

I was reading posts about this system  on this forum.  Installed this module last week, got from ebay and finally got it running.  All seems functioning well alarm,door, locks and was able to start the engine remotely tried it many times but when I tried to insert the key and switch it to on my starter suddenly came on. Heard grinding noise.  Tried combinations of the three wires (pink/white, pink and orange as this wires will just give 12 volts).  Did not install starter kill relay on the starter wire cause still am confused how this will prevent grinding as I've read in this forum. Is there something wrong with alarm itself?  Pls. need help.   Thank you