Page 458 of 585

457 Practical hints
What to do if …
Display symbol
Display messages
Possible cause/consequence
Possible solution
F
Key detected
in vehicle
A SmartKey with KEYLESS-GO*
left in the vehicle was detected
while trying to lock the vehicle
from the outside.
Take the SmartKey with KEYLESS-GO*
out of the vehicle.
Remove key
You have forgotten to remove
the SmartKey.
Remove the SmartKey from the starter
switch.
You need a new key
There is no additional code avail-
able for SmartKey or SmartKey
with KEYLESS-GO*.
Visit an authorized Mercedes-Benz Light
Truck Center as soon as possible.
Change
key batteries
The batteries in the SmartKey
with KEYLESS-GO* are dis-
charged.
Replace the batteries (
page 480).
Don’t forget
your key
This message appears for a
maximum of 60 seconds if the
driver’s door is opened with the
engine shut off and no SmartKey
in the starter switch.
This message is only a reminder.
Insert the SmartKey in the starter switch
(page 40).
or
Take the SmartKey with KEYLESS-GO*
with you when leaving the vehicle.
Page 463 of 585
462 Practical hintsWhat to do if …Display symbol
Display messages
Possible cause/consequence
Possible solution
.
Switch off lights
You have removed the SmartKey
from the starter switch, opened
the driver’s door and left the
headlamps on or removed the
SmartKey with KEYLESS-GO*
from the vehicle and left the
headlamps on.
Switch off the headlamps (
page 66).
Switch off lights
or remove key
You have opened the driver’s
door while the exterior lamp
switch is in positionU and
the SmartKey is still in the start-
er switch.
The parking lamps are still on.
Switch off the headlamps (
page 66).
or
Remove the SmartKey from the starter
switch.
Tail lamp
Left
The left tail lamp is malfunction-
ing. A substitute bulb is being
used.
Replace the bulb as soon as possible
(page 490).
Tail lamp
Right
The right tail lamp is malfunc-
tioning. A substitute bulb is be-
ing used.
Replace the bulb as soon as possible
(page 490).
Page 476 of 585

475 Practical hints
Unlocking/locking in an emergency
Unlocking/locking in an emergency
Unlocking the vehicle
If you cannot unlock the vehicle with the
SmartKey or KEYLESS-GO*, open the driv-
er’s door using the mechanical key.Removing the mechanical key
1Mechanical key locking tab
2Mechanical key
Move locking tab1 in direction of
arrow.
The mechanical key2 comes out.
Slide mechanical key2 out of the
housing.Unlocking the driver’s door
1Unlocking
2Mechanical key
Insert mechanical key2 into the
driver’s door lock until it stops.
Turn mechanical key2 counterclock-
wise to position1 and hold it there.
Pull the door handle until the locking
knob moves up (
page 118).
The driver’s door is unlocked.
Pull the door handle once more to open
the driver’s door.
i
Unlocking the driver’s door with the
mechanical key will trigger the anti-theft alarm
system.
To cancel the alarm:
Press buttonŒ or‹on the
SmartKey.
Insert the SmartKey in the starter switch.
Vehicles with KEYLESS-GO*:
Grasp an outside door handle.
The SmartKey with KEYLESS-GO must be
within 3 ft (1 m) of the vehicle.
Press the KEYLESS-GO* start/stop button
(page 41).
The SmartKey with KEYLESS-GO must be
inside the vehicle.
Page 477 of 585

476 Practical hintsUnlocking/locking in an emergencyLocking the vehicle
If you cannot lock the vehicle with the
SmartKey or KEYLESS-GO*, lock the vehi-
cle carrying out the following steps.
Close the front passenger door, the
rear right door and the tailgate.
Open the driver’s door and the rear left
door.
Press the central locking switch on the
driver’s door (
page 126).
The locking knobs of the front passen-
ger door and the rear doors move
down.
If the vehicle battery is disconnected or
drained:
Press down the locking knobs of
the front passenger door and the
rear doors manually.
Exit the vehicle.
Close the driver’s door.
Enter the vehicle through the rear left
door.
Press down the locking knob of the
driver’s door.
Exit the vehicle.
Close the rear left door.
The vehicle is locked.
Unlocking and opening the tailgate
A minimum height clearance of 7.2 ft
(2.20 m) is required to open the tailgate.If the tailgate can no longer be unlocked
and opened using the Œbutton on the
SmartKey or the KEYLESS-GO* function,
use the manual release to unlock and open
the tailgate.
The manual release is located on the inside
of the tailgate.
1Release lever
2Cover
Remove cover2 from the trim on the
tailgate.
Push release lever1 all the way to the
left.
Lift the tailgate.
!
To prevent inadvertent lockout, make sure
to have the SmartKey or SmartKey with
KEYLESS-GO* with you before proceeding with
the next step. The next step will lock the vehicle.
i
This procedure does not arm the anti-theft
alarm system, nor does it lock the fuel filler flap.
Page 478 of 585

477 Practical hints
Unlocking/locking in an emergency
Fuel filler flap
Open the tailgate (
page 119).
The fuel filler flap release is located behind
a cover in the right side trim panel of the
cargo compartment.
1Lock
2Cover
Insert a suitable object such as a coin
into the slot of lock1.
Turn lock1 counterclockwise by 90°
in direction of arrow.
Remove cover2.3Fuel filler flap release
Pull red fuel filler flap release3 in
direction of arrow.
The fuel filler flap is unlocked.
Open the fuel filler flap (
page 352).
!
Always make sure there is sufficient over-
head clearance.
i
If the vehicle has previously been locked
from the outside using the SmartKey or
SmartKey with KEYLESS-GO*, opening the tail-
gate from the inside will trigger the anti-theft
alarm system.
To cancel the alarm, do one of the following:
With the SmartKey:
Press button
Œ
or
‹
on the
SmartKey.
Insert the SmartKey in the starter switch.
With KEYLESS-GO*:
Grasp an outside door handle.
The SmartKey with KEYLESS-GO must be
within 3 ft (1 m) of the vehicle.
or
Press the KEYLESS-GO start/stop button.
The SmartKey with KEYLESS-GO must be in-
side the vehicle.
Page 479 of 585

478 Practical hintsOpening/closing in an emergencyPower tilt/sliding sunroof*
You can open or close the tilt/sliding
sunroof manually should an electrical
malfunction occur.
The tilt/sliding sunroof drive is located
behind a cover on the overhead control
panel.
1Cover
Remove the SmartKey from the starter
switch.Vehicles with KEYLESS-GO*:
Turn off the engine by pressing the
KEYLESS-GO* start/stop button
(page 67).
Open the driver’s door (this puts
the starter switch in position 0, same
as with the SmartKey removed from
the starter switch). The driver’s door
can then be closed again.
Press on cover1 at the position indi-
cated by the arrow.
Take off cover1.
2Crank
Take crank2 out of the Operator’s
Manual pouch.
Insert crank2 into hole.
Turn crank2 clockwise to
slide sunroof closed
raise sunroof at the rear
Turn crank2 counterclockwise to
slide sunroof open
lower sunroof at the rear
i
Turn crank2 slowly and smoothly.
The tilt/sliding sunroof must be synchronized if
it has been operated manually (
page 244).
Page 481 of 585

480 Practical hintsReplacing SmartKey batteriesIf the batteries in the SmartKey or the
SmartKey with KEYLESS-GO* are dis-
charged, the vehicle can no longer be
locked or unlocked. It is recommended to
have the batteries replaced at an autho-
rized Mercedes-Benz Light Truck Center.
Batteries contain materials that can harm
the environment if disposed of improperly.
Recycling of batteries is the preferred
method of disposal. Many states require
sellers of batteries to accept old batteries
for recycling.Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove mechanical key1 from the
SmartKey or SmartKey with
KEYLESS-GO* (
page 475).1Mechanical key
2Battery compartment
Insert mechanical key1 into opening.
Press mechanical key1 in direction of
arrow.
The battery compartment2 is
unlatched.
Pull battery compartment2 out of the
SmartKey housing.
Warning!
G
Keep the batteries out of reach of children.
If a battery is swallowed, seek medical help
immediately.
i
When inserting the batteries, make sure
they are clean and free of lint.
i
When replacing batteries, always replace
both batteries.
The required replacement batteries are available
at any Mercedes-Benz Light Truck Center.
Page 482 of 585
481 Practical hints
Replacing SmartKey batteries
3Batteries
4Contact spring
Pull out batteries3.
Using a line-free cloth, insert new
batteries3 under contact springs4
with the positive terminal (+) side
facing up.
Return battery compartment2 into
housing until it locks into place.
Slide mechanical key1 back into the
SmartKey or SmartKey with
KEYLESS-GO*.
Check the operation of the SmartKey
or SmartKey with KEYLESS-GO*.