hey how are you
1- the green light is you immobilizer you are correct
2- you will need a factory scanner or equivalent to run a diagnostic scan & retrieve fault codes from the alarm module in the vehicle.
is it the module, the receiver, hood switch , door switch, wiring etc.. , it could be number of reasons & there is not a fuse or a relay that you can pull out to disconnect it unfortunately
3-do you have one or 2 keys , if u have 2 try the other one .
4-Fuse # 6 7.5 AMP & Fuse # 30 7.5 AMP in the underhood fuse box, double check these are good they go to security system
I sent you the alarm immobilizer system diagram showing all components and wires and fuses for your review
You can Try using a Master Reset using the procedure below
Master reset Procedure
1- Disconnect Battery Cables ( Negative & Positive Cables )you can use any electrical wire as an extension if battery cables don't reach .
2- Hold cables Together for 60 secs ,then let go
3- Wait 15 minutes
4- Make sure all doors are closed
5- Reconnect battery Cables
6- Lock & unlock the vehicles using the key from driver door side (if you have a key fob with no blade key, just lock & unlock using the key fob buttons)
7- Enter the vehicle and attempt to start
Please let me know if you need anything else on it, just reply back and we will continue
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ASE Certfied Technician