
Trailer
Brake force booster malfunction ... 219
Trailer coupling
see Towing a trailer
Trailer loads and drawbar nose-
weights .............................................. .177
Trailer towing
Blind Spot Assist ............................ 165
PARKTRONIC ................................. 170
Permissible trailer loads and
drawbar noseweights ..................... 177
Transmission
see Automatic transmission
Transmission oil ................................ 324
Transport
Loading guidelines ......................... 240
Vehicle .......................................... .280
Transport by rail ................................ 154
Transportation
Rail ................................................ 154
Transporting
Load distribution ............................ 242
Securing a load .............................. 242
Trim pieces (cleaning instruc-
tions) ................................................. .270
Trip computer (on-board com-
puter) ................................................. .195
Trip meter
see Trip odometer
Trip odometer
Display (vehicles with steering
wheel buttons) ............................... 187
Display (vehicles without steeringwheel buttons) ............................... 182
Resetting ....................................... 181
see Trip computer (on-board computer)
Turn signals
Replacing bulbs (front) ................... 102
Replacing bulbs (rear) .................... 103
Switching on/off .............................. 94
Turn signals (Chassis Cab)
Replacing bulbs (rear) .................... 104
Twin co-driver's seat
Folding table .................................. 234
Stowage compartment .................. 232
Two-way radios
Type approval/frequency .............. 316 TWR (Tongue Weight Rating) (defi-
nition)
................................................. 305 U
Unlocking From inside the vehicle (central
unlocking button) ............................ .71
USB port .............................................2 38 V
Vehicle Data acquisition ............................... 29
Display message ............................ 216
Electronics ..................................... 316
Equipment ....................................... 22
Individual settings (vehicles with
steering wheel buttons) ................. 188
Limited Warranty ............................ .22
Loading .......................................... 295
Locking (SmartKey) .......................... 66
Lowering ........................................ 310
Maintenance .................................... 28
Parking for a long period ................ 151
Pulling away ................................... 140
Raising ........................................... 307
Registration ............................... 25, 28
Reporting problems ......................... 28
Securing from rolling away ............ 149
Towing away .................................. 277
Transporting .................................. 280
Unlocking (SmartKey )...................... 66
Vehicle battery
see Battery (vehicle)
Vehicle bodies
Body/equipment mounting direc-
tives for trucks ................................. 26
Vehicle data ....................................... 327
Vehicle identification number .......... 316
Vehicle identification plate .............. 316
Vehicle tool kit .................................. 274
Vents
see Air vents
Voltage supply
Fuses ............................................. 280 20
Index

The camera is in the middle of the roof above
the high-mounted brake lamp (Y page 269).
The rear view camera may show obstacles in perspectival distortion, incorrectly or not at
all. The rear view camera cannot display all
objects located very near and/or under the
rear bumper. It does not warn you of a colli-
sion, persons or objects.
The area behind the vehicle is displayed in a
mirrored fashion, as in the rear-view mirror or
the exterior mirrors.
The function of the rear view camera may be
partially or completely impaired in the follow-
ing circumstances:
R it is raining very heavily or snowing, or it is
foggy.
R the parking space is located in a very dark
place.
R the camera is exposed to very strong white
light. White stripes may appear on the dis-
play.
R the surrounding area is illuminated with flu-
orescent light. The display may flicker.
R if the temperature changes very quickly, for
example if you drive into a heated garage in the winter.
R ambient temperatures are very high.
R the camera lens is dirty or obstructed.
R the rear of the vehicle is damaged. In this
case, have the position and setting
checked at a specialist workshop.
The rear view camera is activated when you
engage reverse gear R.
You can find information on cleaning the cam-
era in the "Maintenance and care" section
(Y page 269). Working mode
ADR (working speed governor)
General notes When activated, ADR automatically increases
the engine speed to a preset speed or a speed
you have set.
i After a cold start, the idling speed of the
engine is increased automatically. If the
preset working speed is lower than the
increased idling speed, the working speed
is only reached once the engine has com-
pleted the warm-up phase.
It is only possible to activate ADR with the
vehicle stationary and the parking brake
applied.
The selector lever of the automatic trans-
mission must be in position P.
Activating/deactivating ADR X
To activate: press upper section 0043of the
0091 switch while the engine is running.
The indicator lamp in the switch comes on.
The 004E indicator lamp in the instrument
cluster lights up or the display shows the
following message: Operating speed Operating speed
governor active
governor active.
X To deactivate: press lower section 0044of
the 0091 switch while the engine is run-
ning.
The indicator lamp in the switch goes out. 172
Working modeDriving and parking

otherwise destroy electronic components
such as the alternator.
Always disconnect the starter battery in the battery case in the driver's footwell first.
! Always disconnect the battery in
the order described below. Never swap the
terminal clamps. You may otherwise dam-
age the vehicle electronics.
If the vehicle is expected to be out of use for over 3 weeks, disconnect the batteries. This
will prevent battery discharge caused by off-
load current consumption. Battery cover in the driver's footwell
X Switch off all electrical consumers.
X Switch off the engine and remove the key
from the ignition lock.
X Remove the floor covering in the driver's
footwell (Y page 260).
X Loosen screws 0044and slide battery
cover 0043in the direction of the arrow.
The screws must protrude beyond the
larger recesses.
X Remove battery cover 0043upwards. Starter battery in the driver's footwell
X First loosen and remove the negative ter-
minal clamp so that it is no longer in contact
with the terminal.
X Remove the cover from the positive termi-
nal.
X Loosen the positive terminal clamp and fold
it up to the side together with the pre-fuse
box.
Reconnecting the starter battery !
Always connect the battery in the order
described below. Never swap the terminal
clamps. You may otherwise damage the
vehicle electronics.
X Fold the positive terminal clamp with the
pre-fuse box down to the terminal.
X Connect the positive terminal clamp.
X Attach the cover to the positive terminal.
X Connect the negative terminal clamp.
X Position battery cover 0043so that screws 0044
are positioned over the large recesses.
X Slide battery cover 0043in the direction of
travel into the smaller recesses.
X Tighten screws 0044.
X Install the floor covering in the driver's foot-
well (Y page 260).
Carry out the following work after connecting
the battery:
X Reset the side windows (Y page 79). Battery
261Maintenance and care Z

R
It is particularly important to observe the
described order when connecting and dis-
connecting the jumper cables.
R Never connect or disconnect the battery
terminals while the engine is running.
Disconnecting the additional battery !
Switch off the engine and remove the key
from the ignition lock before you loosen or disconnect the terminal clamps. You may
otherwise destroy electronic components
such as the alternator.
Always disconnect the starter battery in the
battery case in the driver's footwell first.
! Always disconnect the battery in
the order described below. Never swap the terminal clamps. You may otherwise dam-
age the vehicle electronics. Additional battery in the engine compartment
X Switch off all electrical consumers.
X Switch off the engine and remove the key
from the ignition lock.
X Open the hood (Y page 248).
X First loosen and remove the negative ter-
minal clamp so that it is no longer in contact
with the terminal.
X Remove the cover from the positive termi-
nal.
X Loosen and remove the positive terminal
clamp. Connecting the additional battery !
Always connect the battery in the order
described below. Never swap the terminal
clamps. You may otherwise damage the
vehicle electronics.
X Connect the positive terminal clamp.
X Attach the cover to the positive terminal.
X Connect the negative terminal clamp.
X Close the hood.
Carry out the following work after connecting
the battery:
X Reset the side windows (Y page 79). Installing and removing the additional
battery (engine compartment)
Removing the additional battery X
Disconnect the battery (Y page 262).
X Loosen the bolts holding the retainer that
prevents the battery from moving around.
X Remove the battery holder and take out the
battery.
Installing the additional battery X
Insert the battery into the battery case.
X Insert the battery holder.
X Tighten the bolts holding the retainer that
prevents the battery in the engine com-
partment from moving around.
X Connect the battery (Y page 262). Charging
G
WARNING
A discharged battery can freeze at tempera-
tures below freezing point. When jump-start-
ing the vehicle or charging the battery, gases can escape from the battery. There is a risk of
an explosion.
Allow the frozen battery to thaw out before
charging it or jump-starting. Battery
263Maintenance and care Z