GMC 2004 Canyon - Manual (Page 90)

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.
Rear Doors (Extended Cab)
If you have an extended cab, your vehicle has rear
doors for convenience in loading and unloading cargo.
To open a rear door, open the front door. Then, use
the handle located on the front edge of the rear
door panel to open it. You must close the rear door
before closing the front door.
Tailgate
You can open the tailgate by pulling up on the handle
while pulling the tailgate down.
When you put the tailgate back up, be sure it latches
securely.
You can lock the tailgate using your ignition key.
Turn the key counterclockwise to lock the tailgate.
Turn the key clockwise to unlock the tailgate.
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