Mercedes-Benz E-class 1998 Starting and Turning Off the Engine - Manual (Page 22)

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Trunk
1 Neutral position - push to open
2 Unlocking
3 Locking (detent)
4 Separate locking of trunk -
remove key in this position.
When the trunk is separately locked,
it remains locked when unlocking any
door.
To deny any unauthorized person
access to the trunk, lock it separately.
Leave only the valet key with the
vehicle.
Notes:
In case of a malfunction in the central
locking system the doors and trunk can
be locked and unlocked individually.
To lock, turn key to position 3 or push
down lock buttons.
To unlock, turn key to position 2 or pull
up lock buttons.
If the fuel filler flap cannot be opened,
refer to
Fuel Filler Flap, Manual Release
(see Index).
Lower trunk lid using handle (5) or
recessed grip (6), and close it with grip
molding (7).