Operation from inside
To lock any door from the inside, press the door-lock knob.
To unlock, pull it outward. This does not operate the other door locks.

NOTE
The red indication can be seen when the door-lock knob is unlocked.

Operation from outside
To lock the rear and front passenger doors with the door-lock knob from the outside, press the door-lock knob to the lock position and close the door (holding the door handle in the open position is not required).This does not operate the other door locks.
This does not operate the other door locks.

NOTE
When locking the door this way:
Auto Lock/Unlock Function
Rear Door Child Safety LocksMazda 6 Owners Manual: Control system
L.H.D.
R.H.D.
...
Mazda 6 Owners Manual: On-board diagnostic test
DTCs Reading Procedure
1. Perform the necessary vehicle preparation and visual inspection.
2. Connect WDS or equivalent to the vehicle DLC-2 16-pin connector located as
shown in the figure.
3. Retrieve DTCs by WDS or equivalent.
Pending Trouble Code Access Procedure
1. Perform the necessary ...