Toyota 2011 Matrix Owner's Manual page 54

1-2. Opening, closing and locking the doors
■
Inside lock button
Rear door child-protector lock
30
Unlocks the door
Locks the door
The front doors can be opened
by pulling the inside handle
even if the lock buttons are in
the lock position.
The door cannot be opened from
inside the vehicle when the locks
are set.
These locks can be set to prevent
children from opening the rear
doors. Push down on each rear
door switch to lock both rear
doors.