i tried to show in sequeunce how the parts come apart. The lst pic is where the 2nd green connector connects to that 'circuit board'.Looks like the ignition switch in the first picture.
It makes sense that it's the ignition switch. Most anti theft doesn't continue to check the key after a successful interrogation.
Can you post another picture of the socket the extra green connector plugs into? Is it on the immobilizer?
I guess it could be for a factory remote start. I'll check the diagrams tonight.
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The last picture has that little white spring loaded 'nub'. The lock mechanism engages it when you first put the key in the ignition and turn 'on'. Don't know the relevance of it.
This is the ignition/immobilizer/key that i bought from ebay and haven't installed yet, although i did swap out the immobilizer and circuuit board ring with no difference than what's in the pilot now.