
Trailer towing
................................. 146
Transmission oil change ................328
Automatic transmission emer-
gency mode ....................................... 147
Auxiliary heating Activating/deactivating heater
booster mode ................................ 130
Conditions for switching on ...........123
Heating time .................................. 123
Important safety notes ..................122
Operating with the button (control
panel) ............................................ 124
Operation with the remote
control ........................................... 125
Operation with the timer ................127
Problem (malfunction) ...................132
Selecting a switch-on time ............. 124
Setting the switch-on time .............125
see Auxiliary heating
AUX port ............................................ .240
Axle load, permissible (trailer tow-
ing) ...................................................... 333 B
Backup lamps Replacing bulbs ............................. 103
Backup lamps (Chassis Cab)
Replacing bulbs ............................. 104
BAS (Brake Assist System)
Display message ............................ 207
Function/notes ................................ 57
Indicator lamp ................................ 221
Basic settings
see Settings
Battery
Isolating switch .............................. 136
Replacing (SmartKey) ......................69
Battery (SmartKey)
Checking .......................................... 68
Important safety notes ....................68
Replacing ......................................... 69
Battery (vehicle)
Care ............................................... 266
Charge indicator lamp ...................225
Charging ........................................ 266
Disconnecting and connecting
(driver's footwell) ........................... 262Disconnecting and connecting
(engine compartment)
...................264
Disconnecting and reconnecting
(base of driver's seat) ....................265
Display message ............................ 219
Important safety notes ..................260
Installing/removing (base of driv-
er's seat) ........................................ 266
Installing/removing (driver's foot-
well) ............................................... 263
Installing/removing (engine com-
partment) ....................................... 265
Jump starting ................................. 278
Location ......................................... 261
Removing/installing the floor cov-
ering (driver's footwell) ..................261
Before driving off
Important safety notes ..................138
Belt
see Seat belts
Bleeding the fuel system ..................143
Blind Spot Assist Activating/deactivating .................166
Notes/function .............................. 164
Trailer towing ................................. 166
Bodies
Body/equipment mounting direc-
tives for trucks ................................. 28
Bottle holder ...................................... 237
see Cup holder
Brake Assist System
see BAS (Brake Assist System)
Brake fluid
Checking the level .........................256
Display message ............................ 208
Notes ............................................. 328
Warning lamp ................................. 222
Brake force distribution, elec-
tronic
see EBD (electronic brake force
distribution)
Brake lamps
Replacing bulbs ............................. 103
Brake lamps (Chassis Cab)
Replacing bulbs ............................. 104
Brake linings
Display message ............................ 207
Indicator lamp ................................ 225 Index
5 

Electrical fuses
see Fuses
Electrical step
Cleaning ........................................ .271
Display message ............................ 219
Emergency release ..........................74
Function .......................................... .74
Important safety notes ....................73
Indicator lamp ................................ 230
Manual retraction ............................ 74
Obstacle detection ........................... 74
Electrical system
Battery main switch .......................136
Electronic Stability Program
see ESP ®
(Electronic Stability Program)
Emergency exit .................................... 61
Emergency exit window .....................61
Emergency Tensioning Devices Function .......................................... .50
Safety guideline s............................. 43
Emissions control
Service and warranty information ....23
Engine
ADR (working speed governor) ......172
Changing the power output .............25
Check Engine warning lamp ........... 227
Cleaning instructions .....................269
ECO Start (Euro 6 engines) ............140
Engine number ............................... 320
Engine speed setting (working
mode) ............................................ 173
Irregular running ............................ 143
Jump-starting ................................. 278
Operating safety .............................. 25
Starting .......................................... 138
Starting problems ..........................143
Switching off .................................. 152
Tow-starting (vehicle) ..................... 282
Engine, jump-starting .......................278
Engine electronics Notes ............................................. 318
Problem (malfunction) ...................143
Engine oil
Adding ........................................... 254
Additives ........................................ 326
Checking the oil level (on-board
computer) ...................................... 252Checking the oil level using the
dipstick
.......................................... 253
Display message ............................ 216
Filling capacity ............................... 327
Information about oil consump-
tion ................................................ 327
Mixing ............................................ 327
Notes about oil grades ................... 326
Oil change ...................................... 327
Oil level (note) ............................... 252
Viscosity ........................................ 326
Warning lamp ................................. 225
Engine speed setting (working
mode) ................................................. 172
Equipment/conversions .....................27
ESP ®
(Electronic Stability Pro-
gram) Display message ............................ 209
Important safety information ...........57
Indicator lamp ................................ 224
Warning lamp ................................. 221
Exhaust check ................................... 154
Exhaust gas aftertreatment ...............27
DEF level indicator .........................184
DEF reducing agent .......................324
Diesel Exhaust Fluid (DEF) .............324
Display messages (vehicles with-
out steering wheel buttons) ...........202
Display messages (vehicles with
steering wheel buttons) .................213
Indicator lamp ....................... 224, 228
Malfunction ................................... .213
Refilling DEF .................................. 149
Exterior lighting .................................. .92
see Lights
Exterior mirrors
Adjusting ......................................... 89
Important safety notes ....................89
Eyeglasses compartment .................233 F
Fire extinguisher ............................... 278
First-aid kit ......................................... 277
Flat tire Changing a wheel/mounting the
spare wheel ................................... 308
General notes ................................ 30710
Index 

Pets in the vehicle
........................... 56
Seat belts ........................................ 47
Odometer
Display (vehicles without steering
wheel buttons) ............................... 184
Display (vehicles with steering
wheel buttons) ............................... 189
Off-road driving
Checklist after driving off-road ......160
Important safety notes ..................159
Rules for driving off-roa d............... 160
Oil
see Engine oil
On-board computer
Display message ............................ 199
Lighting submenu .......................... 194
On-board computer (vehicles with-
out steering wheel buttons)
Display message ............................ 199
General notes ................................ 184
Setting the clock ............................ 185
Standard displa y............................ 184
On-board computer (vehicles with
steering wheel buttons) Audio menu ................................... 189
Display message ............................ 186
Menu overview .............................. 188
Operating ...................................... .186
Operation menu ............................. 188
Settings menu ............................... 190
Standard displa y............................ 189
Telephone menu ............................ 198
Trip computer menu ......................197
Operating safety
Attachments, bodies, equipment
and conversions ............................... 27
Correct use ...................................... 26
Declaration of conformity ................25
Diagnostics connection ...................25
Digital speedometer and odome-
ter .................................................... 25
Important safety note ......................24
Limited Warranty ............................. 29
Modifying engine output ..................25
Qualified specialist workshop ..........26
Radiator cover ................................. 28
Vehicle registration ..........................23
Warning note sticker ........................26Operating system
see On-board computer
Operator's Manual
General notes .................................. 23
Vehicle equipment ...........................23
Outline lamp
Replacing bulbs ............................. 105
Outside temperature display ...........183
Overhead control panel ......................38
Overrevving range .............................183
Overrun cutoff ................................... 154 P
Paint code number ............................319
Paintwork (cleaning instructions) ...269
Paper holder ...................................... 236
Parking ............................................... 151
Important safety notes ..................151
Parking brake ................................ 152
Wheel chock .................................. 153
see PARKTRONIC
Parking aid
see PARKTRONIC
Parking brake
Display message ............................ 209
Notes/function .............................. 152
PARKTRONIC
Deactivating/activating .................170
Driving system ............................... 168
Function/notes ............................. 168
Important safety notes ..................168
Problem (malfunction) ...................171
Range of the sensors .....................168
Roll-back warning .......................... 170
Trailer towing ................................. 170
Warning displa y............................. 169
Partition sliding door
Important safety notes ....................77
Opening/closing .............................. 77
Passenger compartment air-condi-
tioning system
see Climate control
Passenger compartment heating
see Climate control
Perimeter lamp
Replacing bulbs ............................. 104
Pets in the vehicle ............................... 5614
Index 

Ventilation
Setting the vents ........................... 121
Voltage supply
Fuses ............................................. 283W
Warning and indicator lamps Brakes ........................................... 222
Check Engine ................................. 227
Coolant .......................................... 226
Diesel Exhaust Fluid (DEF) .............224
Electrical step ................................ 230
ESP ®
.............................................. 221
ESP ®
function ................................ 224
Overview .......................................... 35
Seat belt ........................................ 230
Warning- and indicator lamps
ABS ................................................ 221
Air filter .......................................... 228
ASR ................................................ 221
BAS ................................................ 221
Battery charge ............................... 225
Brake wear .................................... 225
Bulbs .............................................. 230
Doors ............................................. 230
Engine oil level ............................... 225
Preglow .......................................... 228
Reserve fuel ................................... 227
Tire pressure monitor ....................229
Water separator ............................. 229
Windshield washer fluid .................229
Warning lamp .................................... 277
Warning triangle ................................ 277
Washer fluid Adding ........................................... 257
Capacities ...................................... 331
Display message ............................ 220
Indicator lamp ................................ 229
Notes ............................................. 330
Wiping with .................................... 107
Wheels
Changing a wheel .......................... 307
Checking ........................................ 287
Cleaning ......................................... 269
Important safety notes ..................286
Interchanging/changing ................307
Mounting a wheel .......................... 308Removing and mounting the spare
wheel
............................................. 314
Storing ........................................... 308
Tightening torque ........................... 312
Window curtain air bag ....................... 46
Windows see Side windows
Windshield
Defrosting ...................................... 118
Windshield heating
Problem (malfunction) ...................119
Switching on/off ........................... 119
Windshield washer fluid
Adding ........................................... 257
Indicator lamp ................................ 229
Windshield wipers
Problem (malfunction) ...................110
Rain and light sensor .....................107
Rear window wiper ........................108
Replacing the wiper blades ............108
Setting the sensitivity (vehicles
with steering wheel buttons and
rain/light sensor) ........................... 196
Switching on/off ........................... 107
Wiping with windshield washer
fluid ............................................... 107
Winter diesel ..................................... 323
Winter driving Slippery road surfaces ...................158
Snow chains .................................. 289
Winter operation
General notes ................................ 288
Radiator cover ................................. 28
Winter tires
M+S tires ....................................... 288
Setting a limit speed ......................155
Wiper blades
Cleaning ......................................... 270
Replacing ....................................... 108
Workshop
see Qualified specialist workshop Index
21 

Instrument cluster
Displays and controls
Instrument cluster on vehicles without steering wheel buttons
Instrument cluster in vehicles with steering-wheel buttons
Function Page
0043
Speedometer 183
0044
Tachometer 183
0087
0074,
0075Brightens/dims the
instrument cluster lighting 183
0085
Fuel gage with fuel filler flap
location indicator
183
0083
Display
Vehicles without steering
wheel buttons
184
Vehicles with steering
wheel buttons 186 Function Page
0084
Reset button
0045 34
006B
Menu button
0079 • changes standard display 184
• selects menus 185
006C
Service button
0098 Checks the engine oil level 25234
Instrument clusterAt a glance 

Indicator and warning lamps
Instrument cluster on vehicles without steering
wheel buttons Instrument cluster in vehicles with steering-wheel buttons
Function Page
0043
Speedometer with warn-
ing and indicator lamps
0072
ESP
®
warning lamp 221
ASR warning lamp 221
003F
Coolant level too low 226
00AC
Coolant temperature too
high 226
0075
Restraint systems malfunc-
tion 42
0065
Brake fluid level too low 222
EBD malfunctioning 221
Trailer brake force booster
malfunction
222
00B2
Engine oil level warning 225 Function Page
00B9
Check Engine indicator
lamp
227
0028
Preglow 138
Preglow system malfunc-
tion
228
0044
Indicator and warning
lamps
004A
Left-hand turn signal 95
0025
ABS malfunction 221
0077
Tire pressure loss or the tire
pressure monitor is mal-
functioning (USA only)
229
Tire pressure loss (Canada
only)
294Instrument cluster
35At a glance 

Problems with the transmission
Problem Possible causes/consequences and
0050
0050Solutions The transmission mal-
functions when shifting
gear. The transmission is losing oil.
X
Have the transmission checked immediately at a qualified spe-
cialist workshop. The acceleration char-
acteristics have deter-
iorated noticeably.
The transmission does
not shift. The transmission is in emergency mode.
It is only possible to shift into second gear or reverse gear
R.
X Stop the vehicle.
X Depress the brake pedal.
X Move the selector lever to position P.
X Switch off the engine.
X Wait at least 10 seconds before restarting the engine.
X Depress the brake pedal.
X Move the selector lever to position Dor R.
In position D, the transmission shifts into second gear; in posi-
tion R, the transmission shifts into reverse gear.
X Have the transmission checked immediately at a qualified spe-
cialist workshop. Releasing the parking lock manually
In the event of a malfunction, it is possible to
manually release the selector lever from the
lock in parking position P, e.g. to have the
vehicle towed away. X
Apply the parking brake.
X Remove cover 0043. X
Slide implement 0044as far as it will go into
the opening.
X Push the implement in and simultaneously
move the selector lever out of position P.
The selector lever lock is released. You can
now move the selector lever freely again
until it is returned to position P.
X Remove implement 0044.
X Re-install cover 0043. Automatic transmission
147Driving and parking Z 

You can find further information on winter
tires and snow chains in the "Wheels and
tires" section (Y page 288). Driving off-road
Important safety notes G
WARNING
If you drive on a steep incline at an angle or
turn when driving on an incline, the vehicle
could slip sideways, tip and rollover. There is
a risk of an accident.
Always drive on a steep incline in the line of
fall (straight up or down) and do not turn the
vehicle. G
WARNING
When driving off-road, your body is subject to
forces from all directions, due to the uneven
surface. You could be thrown from your seat,
for instance. There is a risk of injury.
Always wear a seat belt, even when driving off-
road. G
WARNING
If you drive over obstacles or in ruts, the steer-
ing wheel may jerk out of your grip, causing
injury to your hands.
Always hold the steering wheel firmly with
both hands. When driving over obstacles, you
must expect steering forces to increase
briefly and suddenly. G
WARNING
Flammable material such as leaves, grass or
twigs may ignite if they come into contact with
hot parts of the exhaust system. There is a
risk of fire.
When driving off road or on unpaved roads,
check the vehicle's underside regularly. In
particular, remove parts of plants or other
flammable materials which have become
trapped. In the case of damage, contact a
qualified specialist workshop. !
When driving off-road or on unpaved sur-
faces, check the underside of the vehicle
and the wheels and tires at regular inter-
vals. In particular, remove any trapped for-
eign objects, e.g. stones and branches.
Such foreign objects may:
R damage the chassis, the fuel tank or the
brake system
R cause imbalances and thus vibrations
R be flung out when you continue driving
If there is any damage, inform a qualified
specialist workshop.
! If there are steep gradients while driving
off-road, a sufficient filling level in the DEF
tank must be ensured. Make sure for this
reason that there is a minimum fill level of
ten liters before driving off-road.
When driving off-road and on construction
sites, sand, mud and water mixed with oil, for
example, may get into the brakes. This may
lead to a reduction in braking performance or
total brake failure, also as a result of
increased wear. The braking characteristics
will vary depending on the material that has
got into the system. Clean the brakes after
driving off-road. If you then notice reduced
braking performance or hear scraping noises,
have the brake system checked at a qualified
specialist workshop. Adjust your driving style
to the changed braking characteristics.
Driving off-road or on construction sites
increases the possibility of vehicle damage
which may in turn lead to the failure of certain
assemblies and systems. Adapt your driving
style to the off-road driving conditions. Drive
carefully. Have any vehicle damage rectified
at a qualified specialist workshop as soon as
possible.
When driving on rough terrain, do not shift the
transmission into the neutral position. You
could lose control when attempting to brake
the vehicle with the service brake. If your
vehicle cannot manage an uphill slope, drive
back down the slope in reverse gear. Driving tips
159Driving and parking Z