Mercedes-Benz 2007 SL 55 AMG Operator's Manual page 121

Controls in detail
Locking and unlocking
Locking
Press central locking switch 1.
If all the doors are closed, the vehicle
locks.
Unlocking
Press central unlocking switch 2.
The vehicle unlocks.
i
If the vehicle was previously centrally locked
using the SmartKey or the SmartKey with
KEYLESS-GO*, it will not unlock using the central
locking switch.
If the vehicle was previously locked with the cen-
tral locking switch
while in the global remote control mode, the
complete vehicle is unlocked when a door is
opened from the inside
while in the selective remote control mode,
only the door opened from the inside is un-
locked
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