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: Connectors
Data link connector
Insert the probe into the terminal when connecting a jumper wire to the
data link connector.
Caution
Inserting a jumper wire probe into the data link connector
terminal may damage the terminal.
Disconnecting connectors
When disconnecting connector, grasp ...
Mazda 6 Owners Manual: Anti-theft system
Alarm Conditions
If the anti-theft system protection has been activated, any one of the
following conditions will trigger the system:
- Disconnected battery cable
- Discharged battery
- Disconnected audio unit connectors
If the system is triggered, the audio unit will then be ...