Lockout Protection; Rear Doors (Extended Cab); Tailgate - GMC 2005 Canyon Owner's Manual

Lockout Protection

If you have power door locks, this feature protects you
from locking your key in the vehicle when the key is
in the ignition and a door is open.
If the power door lock switch is pressed when a door is
open and the key is in the ignition, all of the doors
will lock and then the driver's door will unlock.

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.
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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.