Mercedes-Benz 300SD 1981 Owner's Manual page 18

Keys Doors
Master Lock System
The master lock system locks or
unlocks the driver's door, the other
vehicle doors, the fuel tank filler flap
and the trunk lid simultaneously. The
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lock plungers of the other vehicle
doors must then move together with
the lock plunger of the driver's door.
If this does not happen, the lock of
the respective door is not properly
engaged. Open the door again and
shut it correctly.
The front passenger door and the rear
doors can also be locked or unlocked
individually from inside. The front
passenger door can also be locked
and unlocked with the key.
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With the master lock system in the
locked position, the trunk lid can also
be unlocked individually: To do so,
turn the main key to the left as far as it
will go, then depress the trunk lid lock
push button with the key and open
the trunk. Turn the key to its initial
position and withdraw it. To lock the
trunk lid, close it firmly; the trunk lid
will then be locked by the master lock
system again.
The trunk lid can also be locked
independently (for instance, to leave
the vehicle in a workshop) without
actuating the master lock system.
Turn the main key to the right as far as
it will go and withdraw it. In this case
the trunk lid can only be unlocked
with the main key which must be
inserted and turned back to the left.
Note:
If the fuel tank filler flap cannot be
opened, refer to " Unlocking the Fuel
Filler Flap" (page 75).
S eats
Electrical Adjustment of Driver's and
Front Passenger's Seats
Turn key in steering lock to
position " 2" .
Seat and seat back can be adjusted
individually by means of the switches.
These are accommodated in the front
doors.
When the key is withdrawn or turned
to steering lock positions " 1" or " 0",
seat and seat back can be adjusted
only if the driver's door is open.