Master Lock System - Mercedes-Benz 240 D 1979 Owner's Manual

M as te r Lock System
The master lock system sim ulta­
neously locks or unlocks together
w ith the driver's door all other
doors, fuel tank filler flap and trunk
lid. As the driver's door plunger is
moved, the plungers of all other
doors m ust move at the same time.
If this is not the case, the lock of
the corresponding door has not en­
gaged fully. Open the door once
more and close it correctly.
W hen the master lock system has
been applied, the lock plungers of
the fron t passenger door and the
rear doors can also be operated
manually from inside. In addition to
this, the fro n t passenger door can
be locked or unlocked by means
o f the key.
The master lock system can only
be applied by depressing the
plunger on the driver's door. Lock
plungers o f the other doors cannot
be depressed individually.
The trunk lid can also be unlocked
separately by turning master key
counterclockw ise to the stop. Push
the trunk lock button in w ith it and
lift the lid. Return the key to its ini­
tial position and w ith d ra w it. To
lock the lid, close it firm ly. It w ill
then be locked again by the master
lock system.
A provision has been made to
facilitate perm anent locking o f the
trun k lid fo r positive prevention of
access to trunk by unauthorized
persons.
Before leaving vehicle w ith an a t­
tendant, lock trun k w ith mas­
ter key (square head) by turning
key clockw ise to stop (tum bler slot
vertical), then provide attendant
w ith round-headed supplem entary
key. Thus, the trun k lock has been
excluded from the operation o f the
master lock system and cannot be
opened except w ith the square­
headed master key.
To reverse this, turn trunk lock
counterclockw ise back to horizon­
tal position of the tum bler slot
w ith master key. Lock w ill then be
Keys
reengaged in master lock system;
th a t is, it w ill autom atically be
locked or unlocked depending on
w hether the driver's door is locked
or unlocked.
The master lock system operates
on vacuum generated by the en­
gine. A reservoir allows the master
lock system to be actuated about
five times after the engine is turned
off. If the system can then no
longer be engaged, idle engine fo r
a short period.
If no vacuum is available, doors
and trunk have to be locked individ­
ually in the normal manner. The
fuel tank filler flap, however,
remains unlocked.
Note:
If the filler flap cannot be opened
w hen the master lock system is
unlocked, refer to "U nlocking of
the Filler Flap" (page 71).
Doors