GMC 1999 Suburban, Owner'S Manual, Page: 75 / 424

yellow blue
2-5
On the passenger side of the
rear cargo door or tailgate,
there is a power lock switch
which can be used to lock or
unlock all of the doors.
On vehicles with cargo doors, if the rear cargo lock
switch is pressed with the cargo doors open, all of the
doors will lock five seconds after the cargo doors are
closed. If the cargo doors are closed, the vehicle’s doors
will lock when a power door lock switch is pressed.
Child Security Locks (If Equipped)
With this feature, you can
lock the rear side doors so
they can’t be opened from
the inside by passengers.
Move the button up to engage the security feature.
Move the button down to return the door locks to
normal operation.
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.