2007 GMC Envoy Owner's Manual - Page 101

You can use your key to unlock your door from the outside. Power Door Locks The power door lock switches are located on the driver's and front passenger's door armrests. You can lock or unlock the door from the inside by sliding the manual lever forward or rearward. When the door is unlocked, you can see a red area on the lever. The manual lever on each door works only that door's lock. Press the lock symbol to lock all of the doors. To unlock the doors, press the other side of the switch. 101