Originally Posted by gerardvg

Hi

See the starter wiring diagram, the ecm has nothing to do with it.
Most likely the starter solenoid or the starter interrupt relay, now with the wiring diagram you can check where the problem is.

From memory the starter interrupt relay is behind the center information panel, remove the trim panel and the switch/check engine light panel.

Will add the relay location diagram when I get home from work
(is 2:30pm here in Oz)

So check where you have power from the diagram below, the gear selector must be in neutral or park.
The theft deterrent controller grounds the starter interrupt relay, if the security is not disabled with key in door that could be the problem also .

Check the purple wire gets 12 volts when turning the ignition switch to start, if it doesn't check the starter interrupt and theft deterrent .