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: Drive plate removal/installation
1. Remove the transaxle.(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION.)
2. Remove in the order indicated in the figure.
3. Install in the reverse order of removal.
Drive Plate Mounting Bolts Removal Note
1. Set the SST or equivalent against the drive plate.
2. Remove the bolts and the dri ...
Mazda 6 Owners Manual: Operating the Power Windows
NOTE
Each passenger window can be operated with each door switch when the
power window lock switch on the driver's door is in the unlocked position.
Each passenger window can also be operated using the master control switches
on the driver's door.
Normal opening/closing
To open the ...