2002 Nissan Xterra Owner's Manual - Page 141

The shift lever cannot be moved out of P (Park) and into any of the other gear positions if the ignition key is turned to LOCK or if the key is removed. The shift lever can be moved if the ignition switch is in the ACC or OFF position without depressing the foot brake pedal. This allows the vehicle to be moved if the battery is discharged. ASD1024 Shifting Push the button to shift into P (Park), R (Reverse) or from D (Drive) to 2. All other positions can be selected without pushing the button. WARNING Apply the parking brake if the selector lever is in any position while the engine is not running. Failure to do so could cause the vehicle to move unexpectedly or roll away and result in serious personal injury or property damage. P (Park) Use this selector position when the vehicle is parked or when starting the engine. Always be sure the vehicle is at a complete stop. For maximum safety, depress the brake pedal, then push in the shift lever button and move the lever to the P (Park) position. Apply the parking brake. When parking on a hill, apply the parking brake first, then shift the lever into the P (Park) position. Shifting from P (Park) If the ignition switch is in the ON position and the foot brake pedal is depressed, but the shift selector lever still cannot be moved 5-10 Starting and driving