2, locate ecm, it is normally located on the front of firewall, pass. side, behind shock tower. there are 3 or 4 boxes, don't confuse, you need find engine control module. check pin #66 green wire that is for start control, cut the wire after ignition key off and battery negative cable removed. put negative cable back and try to start engine. this will disable the anti-theft system.
3, make sure battery fully charged, clear security system code with a scanner, GT1, or MT2500 with euro software, Vedis, or Solus pro, etc. try to start engine.