The childproof door locks prevent the rear doors from being opened from the inside regardless of the position of the lock tab.
To open the door from the inside when the childproof door lock is on, put the lock tab in the unlock position, lower the rear window, put your hand out of the window, and pull the outside door handle.
■Setting the Childproof Door Locks

Slide the lever in the rear door to the lock position, and close the door.
■ When opening the door
Open the door using the outside door handle.
Rear Seat Belt Replacement
Rear Seat Belt
NOTE:
Check the rear seat belts for damage, and replace them
if necessary.
Remove these items:
Rear door inner seal, as needed
Tailgate weatherst ...
MTF Inspection and Replacement (M/T)
Park the vehicle on level ground, and turn the engine off.
Raise the vehicle on a lift, and make sure it is securely supported.
Remove the splash shield.
...
Rear Bumper Removal/Installation
NOTE:
Put on gloves to protect your hands.
Have an assistant help you when removing and installing the rear bumper.
Take care not to scratch the rear bumper or the body.
...