Using the
0074,0075,0079or0045 adjustment but-
tons, you can select the following functions:
R Calling up the service due date
(Y page 260)
R Checking the oil level (Y page 252)
R Checking the DEF supply (Y page 184)
R Preselecting/setting the auxiliary heating
switch-on time (Y page 124)
R Tire pressure monitor (Y page 293)
R Setting the time (Y page 185)
R Activating/deactivating Highbeam Assist
(Y page 194)
R Setting the daytime running lamps
(Y page 185)
Setting the time X
Turn the key to position 2in the ignition
lock.
X Press the 0079menu button repeatedly until
the hours figure flashes.
X Press the 0074or0075 button to set the hour.
X Press the 0045reset button.
The minute display flashes.
X Press the 0074or0075 button to set the minute.
i If you keep the 0074or0075 button pressed,
the value will change continuously.
Activating/deactivating Highbeam
Assist X
Turn the key to position 2in the ignition
lock.
X Press the 0079menu button repeatedly until
the 00CE indicator lamp flashes and the
on
on orOFF
OFF message appears in the display.
X Use the 0074or0075 button to switch High-
beam Assist on/off.
Switching the daytime running lamps
on/off If you switch the daytime running lights
ON ON,
the daytime running lights will automatically
light up when the engine is running. For safety reasons, it is only possible to
change this setting when the vehicle is sta-
tionary. The factory setting is
ON ONin countries
in which constant headlamp mode or daytime
running lights are mandatory.
X Turn the key to position 2in the ignition
lock.
X Press the 0079menu button repeatedly until
the 0058 indicator lamp flashes and the
on on orOFF
OFF message appears in the display.
X Press the 0074or0075 button to activate or
deactivate the daytime running lamps.
i USA only:
If you turn the light switch to 0060or
0058, the corresponding light switches on.
If you turn the light switch to 0058, the
daytime running lamps remain switched
on.
Canada only:
If you turn the light switch to 0058, the low-
beam headlamps switch on. If you turn the
light switch to 0060or0058, the daytime
running lamps remain switched on. On-board computer (vehicles without steering wheel buttons)
185On-board computer and displays Z
X
Press the 0041or0068 button to select the
desired name.
Or
X To start rapid scrolling: press and hold
the 0041 or0068 button longer than 1 sec-
ond.
Rapid scrolling stops when you release the
button or reach the end of the list.
Using the steering wheel buttons
X To start dialing: press the0061button.
The on-board computer dials the corre-
sponding phone number.
When a connection is established, the
name of the other person and/or the call
duration appear in the display.
X To exit the telephone book: press the
0076 button.
Redialing The on-board computer saves the last names
or numbers dialed in the redial memory.
Using the steering wheel buttons
X Use the 0080or007F buttons to select the
TEL
TEL menu.
The display shows the mobile phone opera-
tional readiness symbol.
X Press the 0061button.
The display shows the most recently dialed
numbers or names in the redial memory.
X Press the 0041or0068 button to select the
desired name or number.
X To start dialing: press the0061button.
The on-board computer dials the corre-
sponding phone number.
When a connection is established, the
name of the other person and/or the call
duration appear in the display.
Or
X To exit the redial memory: press the
0076 button. Display messages
Notes on display messages
Important safety notes G
WARNING
No information will be displayed if either the
instrument cluster or the display is inopera-
tive.
As a result, you will not be able to see warning
and indicator lamps or information about the
driving conditions, such as speed or outside
temperature. Driving characteristics may be
impaired. Adjust your driving style and vehicle
speed accordingly.
Contact a qualified specialist workshop
immediately. G
WARNING
If service work is not carried out correctly, the
operating safety of your vehicle may be
affected. This could cause you to lose control
of your vehicle and cause an accident. More-
over, the safety systems may no longer be
able to protect you or others as they are
designed to do.
Always have service work carried out at a
qualified specialist workshop.
i If you turn the key to position 2in the
ignition, a display check is performed. All
warning/indicator lamps (except the turn
signal indicator lamps) and the display are
activated. Before starting the journey,
check that the warning and indicator lamps
are operating correctly.
Vehicles without steering wheel but-
tons Warnings, malfunctions or additional infor-
mation may also be shown in the display. The
following tables show all the display mes-
sages. A warning tone sounds with certain
display messages. Display messages
199On-board computer and displays Z
Problem Possible causes/consequences and
0050
0050Solutions 00B9
The yellow
Check Engine
indicator lamp is
lit while the
engine is run-
ning. The exhaust gas aftertreatment is malfunctioning or an emission
relevant malfunction has occurred. This malfunction or defect can
damage the exhaust gas aftertreatment.
After the first message and under normal operating conditions,
you can drive on for up to approximately 500 mi (800 km). Then
a warning tone sequence sounds and the engine can only be
started another 16 times.
X
Observe the messages in the display.
X Have the exhaust gas aftertreatment checked immediately at a
qualified specialist workshop.
In some states it is legally prescribed that after the check engine
indicator lamp lights up you must contact a qualified specialist
workshop immediately. Observe the legal requirements. 0028
If you turn the
key to posi-
tion2in the igni-
tion lock, the
yellow preglow
indicator lamp
remains lit for
approximately
1 minute. Or the
yellow preglow
indicator lamp
lights up for
approximately
1 minute while
the engine is
running. At extremely low temperatures, the engine may not start.
There is a malfunction in the preglow system.
X
Have any malfunction rectified at a qualified specialist work-
shop. 009F
The yellow air fil-
ter indicator
lamp is lit while
the engine is
running. The service limit for the air filter has been reached. The air filter
is dirty.
X
Have the air filter element replaced as soon as possible at a
qualified specialist workshop. 228
Indicator and warning lamps in the instrument clusterOn-board computer and displays
X
Turn the key to position 2in the ignition
lock.
X Open drain plug 0044immediately until the
water/fuel mixture flows out of drain
hose 0043.
X Screw in drain plug 0044as soon as approx-
imately 0.2 US qt (0.2 l) of the water/fuel
mixture have been collected.
i The electrical fuel pump halts the flow of
the water/fuel mixture after 30 seconds.
X After draining, turn the key back to posi-
tion 0in the ignition lock.
X Dispose of the collected water/fuel mix-
ture in an environmentally responsible
manner, e.g. at a qualified specialist work-
shop.
X Check drain plug 0044. The drain plug must
be closed.
When the engine is running and drain
hose 0044is open, fuel is lost through drain
hose 0043.
X Close the hood.
If the 00B8 indicator lamp does not go out
after draining:
X Drain the fuel filter again.
X If the 00B8 indicator lamp does not go out
after draining for the second time, have the
cause checked immediately at a qualified
specialist workshop. Vehicle interior
Air filter for the rear-compartment air
conditioning
! Regularly check the air filters for visible
dirt. Clean or replace a dirty filter mat. The
dirt may otherwise lead to damage to the
air-conditioning system. Filter magazine, located on the roof in the rear
compartment
An increased amount of sand or dust may
collect in the air filter of the rear-compart-
ment air conditioning when you drive on dusty
or sandy roads.
X
To remove the filter mat: carefully pry
cover 0043out of recesses 0044and remove.
X Remove the filter mat from the air duct.
X To clean the filter mat: wash the dirty fil-
ter mat with clear water.
X Leave the filter mat to dry.
i The filter mat must not be cleaned or dried
in a machine.
X To install the filter mat: insert the filter
mat in cover 0043.
X Replace and engage cover 0043. Maintenance
General notes
H
Environmental note
Observe measures to protect the environ-
ment when working on the vehicle. You must
observe the legal requirements when dispos-
ing of service products, e.g. engine oil. This
also includes all components, e.g. filters,
which have come into contact with service
products. Any qualified specialist workshop
can provide information about this.
Dispose of empty containers, cleaning cloths
and care products in an environmentally 258
MaintenanceMaintenance and care
When parking your vehicle, make sure that
the tires do not get deformed by the curb or
other obstacles. If it is necessary to drive over
curbs, speed humps or similar elevations, try
to do so slowly and not at a sharp angle. Oth-
erwise, the tires, particularly the sidewalls,
can get damaged. Regular wheel and tire checks
G
WARNING
Damaged tires can cause tire inflation pres-
sure loss. As a result, you could lose control
of your vehicle. There is a risk of accident.
Check the tires regularly for signs of damage
and replace any damaged tires immediately.
Check the wheels and tires of your vehicle for
damage regularly, i.e. at least every two
weeks, as well as after driving off-road or on
rough roads. Damaged wheels can cause a
loss of tire pressure. Pay particular attention
to damage such as:
R cuts in the tires
R punctures
R tears in the tires
R bulges on tires
R deformation or severe corrosion on wheels
Regularly check the tire tread depth and the
condition of the tread across the whole width
of the tire (Y page 287). If necessary, turn
the front wheels to full lock in order to inspect
the inner side of the tire surface.
All wheels must have a valve cap to protect
the valve against dirt and moisture. Do not
install anything onto the valve other than the
standard valve cap or other valve caps
approved for your vehicle by dealers listed on
the inside of the front cover. Do not install any
other valve caps or systems, e.g. tire pressure
monitor systems.
Regularly check the pressure of all the tires,
particularly prior to long trips. Adjust the tire
pressure if necessary (Y page 290).The service life of tires depends on various
factors, including the following:
R
driving style
R tire pressure
R mileage Tire tread
G
WARNING
Insufficient tire tread will reduce tire traction.
The tire is no longer able to dissipate water.
This means that on wet road surfaces, the risk
of hydroplaning increases, in particular where
speed is not adapted to suit the driving con-
ditions. There is a risk of accident.
If the tire pressure is too high or too low, tires
may exhibit different levels of wear at differ-
ent locations on the tire tread. Thus, you
should regularly check the tread depth and
the condition of the tread across the entire
width of all tires.
Minimum tire tread depth for:
R Summer tires: 00CEin (3 mm)
R M+S tires: 00CFin (4 mm)
For safety reasons, replace the tires before
the legally prescribed limit for the minimum
tire tread depth is reached. Bar marking
0043for tread wear is integrated
into the tire tread.
Tread wear indicators (TWIs) are required by
law. Six indicators are positioned over the tire
tread. They are visible once the tread depth
is approximately 00CDin (1.6 mm). If this is the Operation
287Wheels and tires Z