Where is park neutral switch on 2001 Cadillac DTS?

The 2001 Cadillac DTS doesn't have a physical "park neutral switch" in the same way some older cars do. The transmission range selector (the gear shifter) is electronically controlled. The position of the shifter is sensed electronically, and that signal is used by the car's computer to determine if the car is in park or neutral. There isn't a separate switch you can access or adjust. Any problems with the park/neutral sensing would be a problem within the transmission control system itself, not a separate switch.