Global Machinery Company Sierra 1999 - Manual (Page 76)

yellow blue
2-4
To open the rear access
door from the inside, the
passenger’s side front door
must be opened first. Then,
use the handle located on
the inside of the rear access
door to open it. Door Locks
CAUTION:
Unlocked doors can be dangerous.
Passengers -- especially children -- can easily
open the doors and fall out. When a door is
locked, the inside handle won’t open it.
Outsiders can easily enter through an unlocked
door when you slow down or stop your vehicle.
This may not be so obvious: You increase the
chance of being thrown out of the vehicle in a
crash if the doors aren’t locked. Wear safety belts
properly, lock your doors, and you will be far
better off whenever you drive your vehicle.