Where is the interlock switch on a 1999 Cadillac sts?

On a 1999 Cadillac STS, the interlock switch is typically located on the steering column or near the gear shift mechanism. It is a safety feature that prevents the vehicle from being shifted out of "Park" unless the brake pedal is pressed. If you're having trouble locating it, consulting the vehicle's service manual or a professional mechanic may provide more specific guidance.