The central lock can be controlled from the front seats using the buttons on each respective door.
Locking all locks
Press the lock symbol 
on the central lock button.
All of the doors, the trunk hatch and the fuel filler flap are locked.
Unlocking all locks
Press the unlock symbol 
on the central lock button.
Depending on your settings, only the selected door or all doors will unlock, as well as the trunk hatch and fuel filler flap.
Unlocking with the front door handles
Pull on the front door handle.
Depending on your settings, only the selected door or all doors will unlock, as well as the trunk hatch and fuel filler flap.
Unlocking a rear door with the door handle
Note
The child lock needs to be deactivated to unlock the rear doors.
Pull the rear door handle twice.
The door unlocks and opens.