1996 GMC Sonoma Owner's Manual - Page 52

Si :Access Panel (Extenc d Cab) Power Door L rk! If your vehicle has power door locks, the switch is located on the armrest. Press LOCK to lock all the doors at once. To unlock the doors, press the raised area next to the key symbol. Your vehicle may be equipped with a side access panel for convenience in loading and unloading cargo. It is recommended that passengers who sit i n the rear jump seat enter and exit through the door on the passenger's side. To open the side access panel, first open the driver's front door. Then, use the handle on the panel to open it. You must close the side access panel before you can close the driver's door. Leaving Your Vehicle If you are leaving the vehicle, take your keys, open your door and set the locks from inside. Then get out and close the door.