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the information on displaymessages
(
Y page 217).
It maytake up to ten minutesfor amalfunction
of the tire pressure monitor to be indicated.A
malfunctionwillbeindicated by the tire pres-
sure warning lamp flashing for approximately
one minute and thenremaining lit. When the
malfunctionhas been rectified, the tire pressure
warning lamp goes outafter afew minutesof
driving.
The tire pressure values indicated by the on-
boardcomputermay differfromthosemeas-
ured at agas stationwithapressure gauge. The
tire pressures shown by the on-board computer
refer to thosemeasured at sealevel.Athigh
altitudes, the tire pressure values indicated by a
pressure gaugeare higherthanthoseshown by
the on-board computer. In thiscase, do not
reduce the tire pressures.
The operationofthe tire pressure monitor can
be affectedbyinterferencefromradio transmit-
ting equipment (e.g. radioheadphones, two-way
radios) thatmay be being operated in or nearthe
vehicle.
Checkingthe tire pressure electroni-
cally
X
Make sure thatthe SmartKeyisinposition 2
in the ignition lock (
Y page 124).
X
Press = or ; on the steering wheelto
select the Serv.
menu.
X
Press the 9 or : button to select
TirePressure
.
X
Press the a button.
The current tire pressure of each tire is shown
in the multifunctiondisplay.
If the vehiclewas parked for longerthan
20 minutes, the Tirepressure willbe
displayed after drivingafew minutes
message is shown.
After ateach-inprocess, the tire pressure mon-
itorautomaticallydetects new wheels or new
sensors. As long as aclear allocation of the tire
pressure valuetothe individual wheels is not
possible, the Tire
Pressure Monitor Active
message is shown insteadofthe tire pressure
display. The tire pressures arealready being
monitored.
Tire pressure monitorwarning mes-
sages
If the tire pressure monitor detects apressure
loss in one or moretires, awarning message is
shown in the multifunctiondisplay.The yellow
tire pressure warning lamp thenlights up.
R
If the Please CorrectTirePressure
message appearsinthe multifunctiondisplay,
the tire pressure in at leastone tire is too low.
The tire pressure must be correctedwhenthe
opportunity arises.
R
If the Check TirePressure message
appearsinthe multifunctiondisplay,the tire
pressure in one or moretireshas dropped
significantly. The tiresmustbechecked.
R
If the Tire Pressure Warning Tire Fail‐
ure message appears, the tire pressure in one
or moretireshas dropped suddenly. The tires
must be checked.
Observe the instructions and safety notesinthe
displaymessagesinthe "Tires" section
(
Y page 217).
If the wheelpositions on the vehicleare rotated,
the tire pressures maybedisplayed for the
wrong positions for ashort time. Thisisrectified
after afew minutesofdriving, and the tire pres-
sures aredisplayed for the correct positions.
Restartingthe tire pressure monitor
When yourestartthe tire pressure monitor, all
existing warning messagesare deleted and the
warning lamps go out. The monitor uses the cur-
rentlyset tire pressures as the reference values
for monitoring. In mostcases,the tire pressure
monitor will automaticallydetect the new refer-
ence values after youhavechangedthe tire
pressure. However, youcan also setreference
values manuallyasdescribedhere. The tire
pressure monitor thenmonitors the new tire
pressure values.
X
Set the tire pressure to the valuerecommen-
dedfor the corresponding drivingsituationon
the Tire and Loading Informationplacard on
the driver's side B-pillar (
Y page 296).
Youcan findmoretire pressure values for
various operating conditions in the tire pres-
sure table insidethe fuel fillerflap
(
Y page 141).
X
Make sure thatthe tire pressure is correct on
allfourwheels.
302
Tire pressure
Wheelsand tires
304


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