Mercedes-Benz 2008 GL 450 Operator's Manual page 130

The switches are located in the drivers
door.
1 Central unlocking switch
2 Central locking switch
Locking
Press central locking switch 2.
If all doors and the tailgate are closed,
the vehicle locks.
Unlocking
Press central unlocking switch 1.
The vehicle unlocks.
i
You can open a locked door from inside at
any time. Open door only when conditions are
safe to do so.
If the vehicle was previously centrally locked
with the SmartKey or with KEYLESS-GO*, it will
not unlock using the central unlocking switch.
If the vehicle was previously locked with the
central locking switch:
and the SmartKey or SmartKey with
KEYLESS-GO* is set to factory settings, the
complete vehicle is unlocked when a front
door is opened from the inside
and the SmartKey or SmartKey with
KEYLESS-GO* is set to selective settings,
only the front door opened from the inside is
unlocked
i
With the passenger-side door opened, you
cannot lock the vehicle with the central locking
switch.
Controls in detail
Locking and unlocking
129