1998 Nissan Frontier Owner's Manual - Page 68

AIC1012 APD1041 APD1049 Locking doors without key To lock the doors without the key, push the inside lock knob to the lock position, then close the door. When locking the door this way, be certain not to leave the key inside the vehicle. POWER DOOR LOCK (if so equipped) The power door lock system allows you to lock or unlock both doors simultaneously. Turning the key to the front of the vehicle locks both doors. Turning the key one time to the rear of the vehicle unlocks that door. From that position, returning the key to neutral (where the key can only be removed and inserted) and turning it to the rear again within 5 seconds unlocks both doors. To lock from the outside without a key, push the door lock button (driver side only) or the door lock knob (driver or passenger side), then close the door. When locking the door this way, be certain not to leave the key inside the vehicle. If the key is left in the ignition, all doors will unlock automatically. Pre-driving checks and adjustments 3-3