1998 Pontiac Trans Sport Owner's Manual - Page 116

Power Door Locks To lock either front door from the inside, push the locking lever forward. To unlock either front door from the inside, pull back on the locking lever. From the inside, press the front of the power door lock switch (on either front door) to unlock all doors and the liftgate. If your vehicle is equipped with the Content Theft-Deterrent system, the power door lock switch will not unlock the doors until the system is disarmed. See "Content Theft-Deterrent" in the Index for more details. You can lock all doors and the liftgate from the inside by pressing the rear of the power lock switch on either front door. If your vehicle is equipped with the Content Theft-Deterrent system, the power door lock switch may cause the system to arm. See "Content Theft-Deterrent" in the Index for more details. 2-5