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: Remote handle lever removal/installation
4SD
1. To remove the remote wire, remove the trunk side trim.
2. Remove in the order indicated in the table.
3. Install in the reverse order of removal.
5HB
1. To remove the remote wire, remove the trunk side upper trim and trunk side
trim.
2. Remove in the order indicated in the table.
...
Mazda 6 Owners Manual: Bluetooth® Preparation
Device pairing
To use Bluetooth® audio and Hands-Free, the device equipped with Bluetooth® has
to be paired to the unit using the following procedure. A maximum of seven devices
including Bluetooth® audio devices and hands-free mobile phones can be paired.
NOTE
The Bluetooth® system ma ...