There is a solenoid that prevents you from locking the key when the car is not in Park. The solenoid is in the steering column and activated by the shifter. You will have to determine what has failed.
Heres a guide on testing wiring
https://www.2carpros.com/articles/how-to-check-wiring
Heres the wiring diagram for the interlock assembly
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Wednesday, October 15th, 2014 AT 9:11 AM