Page 21 of 290

Sidewall (definition) ....................... 265
Snow chains .................................. 249
Speed rating (definition) ................ 264
Storing ........................................... 267
Structure and characteristics
(definition) ..................................... 264
Summer tires ................................. 249
TIN (Tire Identification Number)
(definition) ..................................... 265
Tire bead (definition) ...................... 265
Tire pressure (definition) ................ 265
Tire pressures (recommended) ...... 264
Tire size (data) ....................... 257, 272
Tire size designation, load-bearing
capacity, speed rating .................... 261
Tire tread ....................................... 248
Tire tread (definition) ..................... 265
Total load limit (definition) ............. 266
Traction (definition) ....................... 266
TWR (permissible trailer drawbar
noseweight) (definition) ................. 266
Uniform Tire Quality Grading
Standards (definition) .................... 264
Wear indicator (definition) ............. 266
Wheel rim (definition) .................... 264
Top Tether ............................................ 50
Touchshift (automatic transmis-
sion) .................................................... 125
Tow-away alarm
Arming/deactivating ........................ 57
Deactivating ..................................... 57
Operation ......................................... 57
Tow-starting
Emergency engine starting ............ 246
Important safety notes .................. 243
Towing
If the vehicle is stuck ..................... 245
Installing/removing the towing
eye ................................................. 244
With a raised front or rear axle ...... 245
Towing a trailer
Axle load, permissible .................... 287
Cleaning the trailer tow hitch ......... 237
Coupling up a trailer ...................... 157
Decoupling a trailer ....................... 159
Driving tips .................................... 155
Important safety notes .................. 155
Notes on retrofitting ...................... 286 Trailer loads ................................... 287
Tow ing aw
ay
Important safety guidelines ........... 243
In the event of malfunctions .......... 244
With both axles on the ground ....... 245
Trailer
Brake force booster malfunction ... 195
Trailer coupling
see Towing a trailer
Trailer loads and drawbar nose-
weights ............................................... 159
Trailer towing
Blind Spot Assist ............................ 146
PARKTRONIC ................................. 153
Permissible trailer loads and
drawbar noseweights ..................... 159
Transmission
see Automatic transmission
Transmission oil ................................ 282
Transport
Loading guidelines ......................... 212
Vehicle ........................................... 246
Transport by rail ................................ 135
Transportation
Rail ................................................ 135
Transporting
Load distribution ............................ 214
Securing a load .............................. 214
Trim pieces (cleaning instruc-
tions) .................................................. 238
Trip computer (on-board com-
puter) .................................................. 174
Trip meter
see Trip odometer
Trip odometer
Display (vehicles with steering
wheel buttons) ............................... 167
Display (vehicles without steering
wheel buttons) ............................... 163
Resetting ....................................... 162
see Trip computer (on-board computer)
Turn signals
Replacing bulbs (front) ..................... 88
Replacing bulbs (rear) ...................... 89
Switching on/off .............................. 81
Turn signals (Chassis Cab)
Replacing bulbs (rear) ...................... 90
Index19
Page 166 of 290

Using thef,g,4or9 adjustment buttons,
you can select the following functions:
RCalling up the service due date
(Ypage 226)
RChecking the oil level (Ypage 220)
RChecking the DEF supply (Ypage 162)
RPreselecting/setting the auxiliary heating
switch-on time (Ypage 108)
RTire pressure monitor (Ypage 253)
RSetting the time (Ypage 164)
RActivating/deactivating Highbeam Assist
(Ypage 171)
RSetting the daytime running lamps
(Ypage 79)
Setting the time
XTurn the key to position 2in the ignition lock.
XPress the 4menu button repeatedly until the
hours figure flashes.
XPress the forg button to set the hour.
XPress the 9reset button.
The minute display flashes.
XPress the forg button to set the minute.
iIf you keep the forg button pressed, the
value will change continuously.
Activating/deactivating Highbeam
Assist
XTurn the key to position 2in the ignition lock.
XPress the 4menu button repeatedly until the
_ indicator lamp flashes and the onorOFFmessage appears in the display.
XUse the forg button to switch Highbeam
Assist on/off.
Switching the daytime running lamps
on/off
If you switch the daytime running lamps on, the
daytime running lamps will automatically light
up when the engine is running.
For safety reasons, it is only possible to change
this setting when the vehicle is stationary. The
factory setting is on
in countries in which day-
time running lamp mode or daytime running
lamps are mandatory.
XTurn the key to position 2in the ignition lock.
XPress the 4menu button repeatedly until the
L indicator lamp flashes and the onorOFFmessage appears in the display.
XPress the forg button to activate or deac-
tivate the daytime running lamps.
iUSA only:
If you turn the light switch to TorL,
the corresponding light switches on. If you
turn the light switch to Ã, the daytime
running lamps remain switched on.
Canada only:
If you turn the light switch to L, the low-
beam headlamps switch on. If you turn the
light switch to TorÃ, the daytime run-
ning lamps remain switched on.
On-board computer (vehicles with
steering wheel buttons)
Operating the on-board computer
Overview
XTo activate the on-board computer: turn
the key to position 1in the ignition lock.
The on-board computer shows vehicle informa-
tion and settings in the display.
You can control the display and the settings in
the on-board computer with the buttons on the
steering wheel.
164On-board computer (vehicles with steering wheel buttons)
On-board computer and displays
Page 258 of 290
the individual tires is displayed or the display
shows the following message:
Tire pres. displayed after driving
for several minutes
XPress the9reset button on the instrument
cluster.
The display shows the following message:
Monitor current tire pressure?
XPress the Wbutton on the steering wheel.
The display shows the following message:
Tire pres. monitor reactivated
The tire pressure monitor activation process
has begun. The tire pressures measured for
the individual wheels are stored as the new
reference values, provided that the tire pres-
sure monitor considers them to be plausible.
If you wish to cancel the restart:
XPress the Xbutton on the steering wheel.
256Tire pressure
Wheels and tires