How can I test the Start Inhibitor/neutral safety switch for an Automatic transmission?

Here is a guide to help you check the immobilizer relay (DMF)

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

I would check all fuses as well. Here are the relay and fuse locations along with the starter wiring diagrams so toy can run a test and get back to me.

Check out the diagrams (Below)

Please let us know what you find.

Cheers

Just to add to this one I looked up the wire diagram and it only shows the start circuit without the neutral safety switch. It shows a black wire with blue stripe coming out of your ignition switch that should have battery voltage when the key is in the start position at your electronic imobilizer control unit which is on the left side of the dash. Then the black wire with a yellow stripe should have battery voltage coming out of it with the key in the start position.

If you have power to both those wires to the immobilizer with everything plugged in and the key in the start position I would say that you tested it and its working. If you do this when the starter is inop of course. If you only have power to the black wire with a blue stripe then I would suspect the immobilizer or there is some other reason for the starter being disabled. If you can think of a better way to test please share with us.

Your welcome keep us posted.