Display messages on vehicles withoutsteering wheel buttons
Display messagesPossible causes/consequences an dMSolutions
_ _ _
V
The activation condition sfo rcruise contro lhav eno tbee nmet .
You can only activat ecruise contro lfrom speeds of 20 mph
(30 km/h).
or
Cruise contro lhas bee ndeactivated due to amalfunction .
XHavecruise contro lchecke dat aqualified specialis tworkshop .
NO TPMSTheNOmessag eis displaye dfo r30 seconds. The TPMSmessag eis also
displaye dafter 30 seconds.
The tire pressure monito rhas malfunctioned.
XHav eth etire pressure monito rand th ewheels checke dat aquali-
fie dspecialis tworkshop .
NO TPMSTheNOmessag eis displaye dfo r30 seconds. The TPMSmessag eis also
displaye dafter 30 seconds.
The tire pressure monito ris no treceivin gsignal sfrom on eor more
wheels because :
Rawhee lhas bee nreplaced wit hth espar ewhee lwithout whee l
electronics.
Rth emaximum temperature on on eof th ewhee lelectronic sunits has
bee nexceeded.
Rth ewhee lelectronic sare malfunctioning.
XHav ewheels wit hsuitable whee lelectronic sunits installed at a
qualified specialis tworkshop .
— —TPMSThe — —messag eis displaye dfo r30 seconds. The TPMSmessag eis
also displaye dafter 30 seconds.
The pressure is insufficien tin on eor more tires ,or th epressures of th e
individual tires diffe rsignificantly.
XChec kth etire pressure and correc tit if necessary (Ypage 253).
dEF ChkIn addition,th eyello wå DEFindicator lamp lights up in th einstru-
men tcluster and awarnin gtone sounds.
The DE Fsupply has dropped belo w1.5US gal (5.5l).
XAdd DEF supply (Ypage 129).
The å DEF indicator lamp only disappears when the vehicle is
stationary, at the latest after 20 secondsa s soon as you switch on
the ignition or start the engine after refueling.
In addition, the yellow ;Check Engine indicator lamp and the yel-
low å DEF indicator lamp light up in the instrument cluster and a
warning tone sounds.
The DEF reducing agent is contaminated, diluted or is not compliant
with ISO 22241.
XHave the DEF tank cleaned and refilled at a qualified specialist
workshop as soon as possible.
178Display messages
On-board computer and displays
Tire valve
GWARNING
Tire valve that are not approved for your vehi-
cle by the distributor named on the inside
cover page may result in a loss of tire pres-
sure. This may affect road safety. There is a
risk of an accident.
Only use tire valve that are approved for your
vehicle by the distributor named on the inside
cover page. Always make sure you have the
correct tire valve type for the tires on your
vehicle.
!Do not screw additional weights (check
valves, etc.) onto the tire valves. The elec-
tronic components could thus be damaged.
Only for vehicles without a tire pressure moni-
tor:
For safety reasons, Mercedes-Benz recom-
mends that you only use tire valves that have
been tested for use on your vehicle.
Checking the tire pressure manually
In order to determine and adjust the tire pres-
sures, proceed as follows:
XRemove the valve cap of the tire you wish to
check.
XPress the tire pressure gauge securely onto
the valve.
XRead the tire pressure and compare it with the
recommended value on the loading informa-
tion table or the tire pressure table
(
Ypage 250).
XIf the tire pressure is too low, increase it to the
recommended value.
XIf the tire pressure is too high, release air by
pressing down the metal pin in the valve. Use
the tip of a pen, for example. Then, check the
tire pressure again using the tire pressure
gauge.
XScrew the valve cap onto the valve.
XRepeat the steps for the other tires.
Tire pressure monitor
Important safety notes
GWARNING
Each tire, including the spare (if provided),
should be checked at least once a month
when cold and inflated to the pressure rec-
ommended by the vehicle manufacturer on
the Tire and Loading Information placard on
the driver's door B-pillar or the tire pressure
label on the inside of the fuel filler flap. If your
vehicle has tires of a different size than the
size indicated on the Tire and Loading Infor-
mation placard or the tire pressure label, you
should determine the proper tire pressure for
those tires.
As an added safety feature, your vehicle has
been equipped with a tire pressure monitoring
system (TPMS) that illuminates a low tire pres-
sure telltale when one or more of your tires
are significantly underinflated. Accordingly,
when the low tire pressure telltale illuminates,
you should stop and check your tires as soon
as possible, and inflate them to the proper
pressure. Driving on a significantly underin-
flated tire causes the tire to overheat and can lead to tire failure. Underinflation also
reduces fuel efficiency and tire tread life, and
may affect the vehicle's handling and stop-
ping ability.
Please note that the TPMS is not a subs titute
fo
r proper tire maintenance, and it is the driv-
er's responsibility to maintain correct tire
pressure, even if underinflation has not
reached the level to trigger illumination of the
TPMS low tire pressure telltale.
USA only:
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate if the
system is not operating properly. The TPMS
malfunction indicator is combined with the
low tire pressure telltale. When the system
detects a malfunction, the warning lamp will
flash for approximately a minute and then
remain continuously illuminated. This
sequence will be repeated every time the vehi-
Tire pressure253
Wheels and tires
Z
cle is started as long as the malfunction
exists.
When the malfunction indicator is illuminated,the system may not be able to detect or signal
low tire pressure as intended. TPMS malfunc-
tions may occur for a variety of reasons,
including the mounting of incompatible
replacement or alternate tires or wheels on
the vehicle that prevent the TPMS from func-
tioning properly. Always check the TPMS mal-
function telltale after replacing one or more
tires or wheels on your vehicle to ensure that
the replacement or alternate tires and wheels
allow the TPMS to continue to function prop-
erly.
Vehicles with a tire pressure monitor are equip-
ped with sensors in the wheels that monitor the
tire pressure of all four tires. The tire pressure
monitor monitors the pressure in all four tires;
you set this pressure when you activate the tire
pressure monitor. The tire pressure monitor
warns you when the pressure drops in one or
more of the tires. The tire pressure monitor only
functions if the corresponding sensors are
installed on all wheels.
You should always adjust the tire pressure
according to the vehicle load. Restart the tire
pressure monitor if you change the tire pres-
sure.
The tire pressure monitor does not warn you if a
tire pressure is incorrect. Observe the notes on
the recommended tire pressure (
Ypage 250).
The tire pressure moni tor i
s not able to warn you
of a sudden loss of pressure, e.g. following pen- etration by a foreign object. In this event, brake
the vehicle until it comes to a standstill. Do not
carry out any sudden steering maneuvers.
The tire pressure monitor has a yellow h
warning lamp in the instrument cluster for indi-
cating pressure loss/malfunctions (USA) or
pressure loss (Canada). Depending on how the
warning lamp flashes or lights up, an underin-
flated tire or a malfunction in the tire pressure
monitor is displayed:
Rif the h warning lamp is lit continuously,
the tire pressure on one or more tires is sig- nificantly too low. The tire pressure monitor is
not malfunctioning.
RUSA only: if the hwarning lamp flashes for
60 seconds and then remains lit constantly,
the tire pressure monitor is malfunctioning.
Only vehicles with steering wheel buttons: the
on-board computer displays information on tire
pressure. After a few minutes of driving, the cur-
rent tire pressure of each tire is shown in the on-
board computer.
USA only: if the tire pressure monitor is mal-
functioning, it may be more than 10 minutes
before the malfunction is shown. The htire
pressure warning lamp flashes for 60 seconds
and then remains lit. When the malfunction has been rectified, the htire pressure warning
lamp goes out after a few minutes of driving.
The tire p
ressure values indicated by the on-
board computer may differ from those meas-
ured at a gas station with a pressure gage. The
tire pressures shown by the on-board computer
refer to those measured at sea level. At high
altitudes, the tire pressure values indicated by a pressure gage are higher than those shown by
the on-board computer. In this case, do not
reduce the tire pressures.
If radio transmitting equipment (e.g. wireless
headphones, two-way radios) is operated inside
the vehicle or in the vicinity of the vehicle, this
can interfere with the operation of the tire pres-
sure monitor.
Checking the tire pressure electroni-
cally (vehicles with steering wheel but-
tons)
Tire pressure display
254Tire pressure
Wheels and tires
Using the steering wheel buttons
XTurn the SmartKey to position2in the ignition
lock.
XPress the VorU button repeatedly
until the standard display is shown
(
Ypage 167).
XPress the 9or: button repeatedly
until the current pressure of the individual
tires is shown in the display.
If the vehicle is parked for longer than
20 minutes or you then drive at less than 18 mph
(30 km/h), the Tire pres. displayed
after driving for several minutesmes-
sage appears.
iThe tire pressure value shown in the display
may differ from those measured at a gas sta-
tion using a pressure gage. The on-board
computer will generally give you a more exact
value.
Tire pressure loss warning system
Vehicles with steering wheel buttons
If the tire pressure monitor detects a pressure
loss in one or more tires, the on-board computer
displays the yellow Tire
pres.Adjustpres.warning message. The htire pressure loss
warning lamp in the instrument cluster
(
Ypage 202) flashes for about 60 seconds and
then remains lit.
The pressure of the affected tire is highlighted in
yellow in the on-board computer (
Ypage 176).
If the tire pressure monitor detects a significant
pressure loss in one or more tires, the on-board
computer displays the red Tire pres.
Warn‐ingTiredefectwarning message. Theh
tire pressure loss warning lamp in the instru-
ment cluster (
Ypage 202) flashes for about 60
seconds and then remains lit. An additional
warning tone sounds.
The pressure of the affected tire is highlighted in
yellow in the on-board computer (
Ypage 176).
Restarting the tire pressure monitor
When you restart the tire pressure monitor, the
currently set tire pressure are taken as refer-
ence values for monitoring. In most cases, the tire pressure monitor detects
the new reference values automatically, e.g.
after you have:
Rchanged the tire pressure
Rchanged wheels or tires
Rinstalled new wheels or tires
However, you can also define reference values
manually as described here.
Before restarting the tire pressure monitor:
XSet the tire pressure to the value recommen- ded on the Tire and Loading Information plac-
ard or the tire pressure table on the B-pillar on
the driver's side (
Ypage 250).
Observe the notes on tire pressure when
doing so (
Ypage 250).
XMake sure that the tire pressure is correct on
all four wheels.
Restarting the tire pressure monitor (vehi-
cles without steering wheel buttons):
XTurn the SmartKey to position 2in the ignition
lock.
XPress the 4menu button on the instrument
cluster repeatedly until the display shows the
following message:
+CAL- TPMS
XPress the fbutton on the instrument clus-
ter.
The display shows:
OK TPMS
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 gbutton or the 4menu button on
the instrument cluster.
The activation process is canceled automati-
cally if 30 seconds elapse without input.
Restarting the tire pressure monitor (vehi-
cles with steering wheel buttons):
XTurn the key to position 2in the ignition lock.
XPress the VorU button on the steering
wheel until the standard display (Ypage 167)
appears in the display.
XPress the 9or: button on the steering
wheel repeatedly until the current pressure of
Tire pressure255
Wheels and tires
Z