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: Center panel module disassembly/assembly
Caution
Before disassembling the center panel module, spread a cloth on the floor to
put the disassembled parts on. This protects the surface of the panel from
scratches or dirt.
1. Remove the center panel module. (See CENTER PANEL MODULE
REMOVAL/INSTALLATION.)
2. Remove in the order i ...
Mazda 6 Owners Manual: Windshield Defrosting and Defogging
Press the windshield defroster switch. In this position, the outside air position
is automatically selected, and the air conditioner automatically turns on. The air
conditioner will directly dehumidify the air to the front windshield and side windows.
Airflow amount will be increased.
WARNING
...