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: Dashboard removal/installation
1. Disconnect the negative battery cable.
2. Remove the glove compartment.
3. Remove the console.
4. Remove the meter hood.
5. Remove the instrument cluster.
6. Remove the column cover.
7. Remove the lower panel.
8. Remove the steering shaft.
9. Remove the A-pillar trims.
10. Remove the fro ...
Mazda 6 Owners Manual: Vehicle speedometer sensor (vss) inspection
Visual Inspection
1. Remove the VSS. (See VEHICLE SPEEDOMETER SENSOR (VSS)
REMOVAL/INSTALLATION.)
2. Make sure that the sensor is free of any metallic shavings or particles.
If any are found on the sensor, clean them off.
3. Install the VSS. (See VEHICLE SPEEDOMETER SENSOR (VSS)
REMOVAL ...