1. Turn the ignition switch to the ON position (engine off).
2. Verify that the selector lever is in the P position.
3. Without the brake pedal depressed, verify that the selector lever cannot be shifted the P position.
4. Depress the brake pedal and verify that the selector lever can be shifted from the P position.
If there is any malfunction, adjust the interlock cable. (See INTERLOCK CABLE ADJUSTMENT.)