Mercedes-Benz GLA 180 Owner's Manual page 343

Tyre pressure
340
Tyre pressure monitor
General notes
If a tyre pressure monitor is fitted, the vehicle's
wheels have sensors fitted that monitor the tyre
pressures in all four tyres. The tyre pressure
monitor warns you if the pressure drops in one
or more of the tyres. The tyre pressure monitor
functions only if the corresponding sensors are
fitted to all wheels.
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.
display, see illustration (example).
Information on the message display can be
found in the "Checking the tyre pressure elec-
tronically" section (
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
( page 337). Note that the correct tyre pres-
Y
sure for the current operating situation must
first be learnt by the tyre pressure monitor. If a
substantial loss of pressure occurs, the warning
threshold for the warning message is aligned to
the learnt reference values. Restart the tyre
pressure monitor after adjusting to the cold tyre
pressure ( page 341). The current pressures
Y
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
( page 337).
Y
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 this event,
bring the vehicle to a halt by braking carefully.
Avoid abrupt steering manoeuvres.
menu of the multifunction
page 340).
Y
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:
if the warning lamp is lit continuously, the tyre
R
pressure on one or more tyres is significantly
too low. The tyre pressure monitor is not mal-
functioning.
if the warning lamp flashes for approximately
R
one 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
( page 256).
Y
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
Make sure that the key is in position 2 in the
X
ignition lock ( page 144).
Y
Press = or ; on the steering wheel to
X
select the Serv. Serv. menu.
Press the 9 or : button to select
X
Tyre Tyre pressure pressure.
Press the a button.
X
The current tyre pressure for each wheel will
be displayed in the multifunction display.