All doors lock automatically when the lock side is pressed. They unlock when the unlock side is pressed.
Driver's door

Front passenger's door

To lock all the doors from an open front door, press the lock side of the door lock switch and then close the door.
NOTE
When locking the doors this way, be careful not to leave the key inside the vehicle.
Locking, Unlocking with Transmitter
Auto Lock/Unlock FunctionMazda 6 Owners Manual: Key reminder switch inspection
1. Disconnect the negative battery cable.
2. Remove the column cover. (See COLUMN COVER REMOVAL/INSTALLATION)
3. Disconnect the key reminder switch connector.
4. Inspect for continuity between the key reminder switch terminals using an
ohmmeter.
If not as specified, replace the key reminder ...
Mazda 6 Owners Manual: Trip Computer and INFO Switch (Without Multi-information Display)
The following information can be selected by pressing the INFO switch with the
ignition switched ON.
Distance-to-empty mode
Average fuel economy mode
Current fuel economy mode
Compass mode
If you have any problems with your trip computer, consult an Authorized Mazda
Dealer.
Distanc ...