Mercedes-Benz 350 SDL Owner's Manual page 29

Central Locking System
The entire vehicle may be locked or
unlocked with the central locking
system by:
• Using the master or valet key in
either front door.
• Using the master key in the trunk
lock.
• Pushing down or pulling up the in­
terior door lock button at either
front door.
The central locking system locks or
unlocks all doors, trunk lid and fuel
filler flap simultaneously.
Doors
When you lock the car, all door lock
buttons should move down. If any one
stays up, the respective door is not
properly closed. You should then
unlock the car, open and reclose this
door, and lock the car again.
The central locking system can be
engaged from the driver's door lock
button, provided the door is complete­
ly closed. It can also be engaged from
the front passenger door if the ignition
key is removed, or the key is inserted
in the steering lock without having
been turned (key in position 0).
If the car has been locked from the
outside, the anti-theft alarm will come
on if a door is opened from the inside.
Trunk
To unlock the trunk with the central
locking system, turn the master key in
the trunk lock completely to the left
and let it return to the vertical position.
Push in trunk lock button and open
the trunk. To lock the trunk, turn the
master key completely to the right and
let it return to the vertical position.
The trunk can remain locked while the
central locking system is unlocked
(e.g. while driving or when leaving the
car in a situation where it must be
driven using the valet key, but you
wish the trunk to remain locked at
parking lots, workshops, etc.). Turn
the master key completely to the right
and pull it out in the horizontal posi­
tion. Now the trunk can only be
unlocked with the master key by
turning it back completely to the left.
Important!
If the trunk is unlocked with the
master key, the doors and fuel filler
flap will also be unlocked. After
closing the trunk, the central locking
system must again be engaged using
the key to relock the doors and fuel
filler flap.
Note:
If the fuel filler flap cannot be opened,
refer to "Manual Release of Fuel Filler
Flap" (page 84).