Information on tyre pressures is shown on the
multifunction display. After a few minutes of
driving, the current tyre pressure of each tyre is
shown in the Serv.
Serv. menu of the multifunction
display, see illustration (example). For information on the message display, refer to
the "Checking the tyre pressure electronically"
section (Y page 316).
Important safety notes It is the driver's responsibility to set the tyre
pressure to the recommended cold tyre pres-
sure suitable for the operating situation
(Y page 313). Note that the correct tyre pres-
sure for the current operating situation must
first be taught-in to the tyre pressure monitor. If
a substantial loss of pressure occurs, the warn- ing threshold for the warning message is aligned
to the taught-in reference values. Restart the
tyre pressure monitor after adjusting to the cold tyre pressure (Y page 317). The current pres-
sures are saved as new reference values. This
ensures that a warning message appears only if the tyre pressure drops significantly.
The tyre pressure monitor does not warn you of
an incorrectly set tyre pressure. Observe the
notes on the recommended tyre pressure
(Y page 313).
The tyre pressure monitor is not able to warn
you of a sudden loss of pressure, e.g. if the tyre is penetrated by a foreign object. In the event of
a sudden loss of air, bring the vehicle to a halt by
braking carefully. Avoid abrupt steering
manoeuvres.
The tyre pressure monitor has a yellow warning lamp on the instrument cluster for indicating a
pressure loss or malfunction. Depending on how
the warning lamp flashes or lights up, a tyre
pressure that is too low or a malfunction in the
tyre pressure monitor is indicated:
R If the warning lamp is lit continuously, the tyre
pressure on one or more tyres is significantly too low. The tyre pressure monitor is not mal-
functioning.
R If the warning lamp flashes for around a
minute and then remains lit constantly, the
tyre pressure monitor is malfunctioning.
In addition to the warning lamp, a message
appears on the multifunction display. Observe
the information on display messages
(Y page 239).
It may take up to ten minutes for a malfunction
of the tyre pressure monitor to be indicated. A
malfunction will be indicated by the tyre pres-
sure warning lamp flashing for approximately
one minute and then remaining lit. When the
fault has been rectified, the tyre pressure warn- ing lamp goes out after you have driven for a few
minutes.
The tyre pressure values indicated by the on-
board computer may differ from those meas-
ured at a filling station using a pressure gauge.
The tyre pressures shown by the on-board com- puter refer to those measured at sea level. At
high altitudes, the tyre pressure values indica-
ted by a pressure gauge are higher than those
shown by the on-board computer. In this case,
do not reduce the tyre pressures.
The operation of the tyre pressure monitor can
be affected by interference from radio transmit- ting equipment (e.g. cordless headphones, two-
way radios) that may be being operated in or
near the vehicle.
Checking the tyre pressure electroni-
cally X
Make sure that the key is in position 2in the
ignition lock (Y page 133).
X Press =or; on the steering wheel to
select the Serv. Serv.menu.
X Press the 9or: button to select
Tyre pressure
Tyre pressure.
X Press the abutton.
The current tyre pressure for each wheel will
be displayed in the multifunction display.
If the vehicle was parked for longer than
20 minutes, the Tyre pressures will be Tyre pressures will be
displayed
displayed after
aftera
afew
few minutes
minutes of
ofdriv‐
driv‐
ing
ing message is shown.
After a teach-in period, the tyre pressure moni-
tor automatically detects new wheels or new
sensors. As long as a clear allocation of the tyre
pressure values to the individual wheels is not
possible, the Tyre Tyrepressure
pressure monitor
monitoractive
active 316
Tyre pressureWheels and tyres
message is shown instead of the tyre pressure
display. The tyre pressures are already being
monitored.
After an emergency spare wheel has been fitted,
the system may still display the tyre pressure of the removed wheel for a few minutes. If this
occurs, note that the value displayed for the
position where the spare wheel is fitted is not
the same as the current tyre pressure of the
emergency spare wheel.
Warning messages of the tyre pressure monitor If the tyre pressure monitor detects a pressure
loss in one or more tyres, a warning message is
shown in the multifunction display. The yellow
tyre pressure warning lamp then lights up:
R If the Please correct tyre pressure
Please correct tyre pressure
message appears in the multifunction display,
the tyre pressure in at least one tyre is too
low. The tyre pressure must be corrected
when the opportunity arises.
R If the Tyre Tyre pressure
pressure Check
Checktyre(s)
tyre(s) mes-
sage appears in the multifunction display, the tyre pressure in one or more tyres has drop-
ped significantly. The tyres must be checked.
R If the Tyre pressure Caution Tyre mal‐
Tyre pressure Caution Tyre mal‐
function
function message appears in the multifunc-
tion display, the tyre pressure in one or more tyres has dropped suddenly. The tyres must
be checked.
Observe the instructions and safety notes in the display messages in the "Tyres" section
(Y page 239).
If the position of the wheels on the vehicle is
changed, the tyre pressures may be displayed in the wrong positions for a short time. After a few
minutes of driving, this is rectified and the tyre
pressures are displayed in the correct positions.
Restarting the tyre pressure monitor When you restart the tyre pressure monitor, all
existing warning messages are deleted and the
warning lamps go out. The monitor uses the cur-
rently set tyre pressures as the reference values for monitoring. In most cases, the tyre pressure
monitor will automatically detect the new refer- ence values after you have changed the tyre
pressure. However, you can also set reference
values manually as described here. The tyre
pressure monitor then monitors the new tyre
pressure values. X
Use the table on the inside of the fuel filler flap
to ensure that the tyre pressure is set cor-
rectly in all four tyres for the current operating conditions.
Also observe the notes in the section on tyre
pressures (Y page 313).
X Make sure that the key is in position 2in the
ignition lock (Y page 133).
X Press =or; on the steering wheel to
select the Serv.
Serv.menu.
X Press the 9or: button to select
Tyre pressure Tyre pressure.
X Press the abutton.
The multifunction display shows the current
tyre pressure for each tyre or the Tyre Tyrepres‐
pres‐
sures
sures will
willbe
bedisplayed
displayed after
aftera
afew
few
minutes of driving
minutes of driving message.
X Press the :button.
The multifunction display shows the Use
Use
current pressures as new reference
current pressures as new reference
values values message.
If you wish to confirm the restart: X Press the abutton.
The Tyre
Tyre press.
press. monitor
monitor restarted
restarted mes-
sage appears in the multifunction display.
After you have driven for a few minutes, the
system checks whether the current tyre pres-
sures are within the specified range. The new tyre pressures are then accepted as refer-
ence values and monitored.
If you wish to cancel the restart:
X Press the %button.
The tyre pressure values stored at the last
restart will continue to be monitored.
Radio type approval for the tyre pres-
sure monitor Country Radio type approval number
Argentina MW2433A
H-12337
GG4
H-12338
Brazil 2770-12-8001
Model: MW2433A
0381-13-8001
Model: GG4 Tyre pressure
317Wheels and tyres Z
