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Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
What model car is this?
Here is the wire diagram that goes with this circuit.
The interlock control module needs to energize the ignition lock solenoid with power and ground to allow key removal. Can you confirm the module is getting power and ground on the yellow and black wires. Can you confirm the white/black and black/blue wires are grounded with the shifter in park.
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Did you see the wire diagram I sent showing those wires and the location of all the parts?