You need two keys with unique chips. Only one has to actually turn the ignition, at a pinch.
I would like you to verify some pinouts/wires starting from the diagnostic port.
Can you please check:
- There are two permanently grounded pins.
- One permanently live pin
- Continuity of the CAN pair that go direct to the PCM
- Continuity to the far side of C-158, for wire 70
- Continuity between PCM pin 13 and corresponding diagnostic connector pin