2016 MERCEDES-BENZ GLS SUV key

X
Press the abutton.
The tyre pressure values stored at the last
restart will continue to be monitored. Tyre pressure monitor
General notes If a tyre pressure monitor system is fitted, the
vehicle's wheels have sensors fitted that moni-
tor 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 pres- sure 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.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 367).
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 364). 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 368). 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 364). 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 in 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 283).
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 148).
X Press the =or; button on the steering
wheel to select the Serv. Serv.menu. Tyre pressure
367Wheels and tyres Z

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 has been 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 appears.
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
Tyre pressure
pressure monitor
monitoractive
active
display 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 Rectify tyre pressure Rectify 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 Check
Check tyre(s)
tyre(s) message appears in the
multifunction display, the tyre pressure in at
least one tyre has dropped significantly. The
tyres must be checked.
R If the Warning tyre defect
Warning tyre defect message
appears in the multifunction display, the tyre
pressure in at least one tyre has dropped sud- denly. The tyres must be checked.
Observe the instructions and safety notes in the display messages under "Tyres" (Y page 283).
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 364).
X Make sure that the key is in position 2in the
ignition lock.
X Press the =or; button 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 the individual tyres or the
Tyre pressures will be displayed Tyre pressures will be displayed
after a few minutes of driving after a few minutes of driving mes-
sage.
X Press the :button.
The Use
Use current
current pressures
pressures as
asnew
new ref‐
ref‐
erence
erence values
valuesmessage appears in the mul-
tifunction display.
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. 368
Tyre pressureWheels and tyres

The wear patterns on the front and rear tyres
differ depending on the operating conditions.
Interchange the wheels before a clear wear pat-
tern has formed on the tyres. Front tyres typi-
cally wear more on the shoulders, while rear
tyres wear more in the centre.
On vehicles that have the same size front and
rear wheels, you can interchange the wheels
every 5,000 to 10,000 km depending on the
degree of tyre wear. Ensure that the direction of
rotation is maintained.
Clean the contact surfaces of the wheel and the
brake disc thoroughly every time a wheel is
interchanged. Check the tyre pressure and, if
necessary, restart the tyre pressure loss warn-
ing system or the tyre pressure monitor
(Y page 366). Direction of rotation
Tyres with a specified direction of rotation have additional benefits, e.g. if there is a risk of aqua- planing. These advantages can only be gained if
the tyres are fitted corresponding to the direc-
tion of rotation.
An arrow on the sidewall of the tyre indicates its correct direction of rotation. Storing wheels
Store wheels that are not being used in a cool,
dry and preferably dark place. Protect the tyres
against oil, grease, petrol and diesel. Fitting a wheel
Preparing the vehicle X
Vehicles with an emergency spare wheel:
when fitting the emergency spare wheel in the
event of a flat tyre, observe the additional
notes on vehicle preparation under "Flat tyre"
(Y page 346).
X Stop the vehicle on solid, non-slippery and
level ground.
X Apply the electric parking brake manually.
X Move the front wheels to the straight-ahead
position.
X Vehicles with automatic transmission:
shift the transmission to position
P.X
Vehicles with the AIRMATIC package:
make sure that the normal vehicle level is
selected (Y page 198).
X Vehicles with the Off-Road Engineering
package:
make sure that the normal level is
selected (Y page 192).
X Switch off the engine.
X Vehicles without KEYLESS-GO: remove the
key from the ignition lock.
X Vehicles with KEYLESS-GO: open the driv-
er's door.
The on-board electronics now have status 0.
This is the same as the key having been
removed.
X Vehicles with KEYLESS-GO: remove the
Start/Stop button from the ignition lock
(Y page 148).
X If included in the vehicle equipment, remove
the tyre-change tool kit from the vehicle.
X Safeguard the vehicle against rolling away.
i Apart from certain country-specific varia-
tions, vehicles are not equipped with a tyre-
change tool kit. For information on which
tools are required to perform a wheel change
on your vehicle, consult a Mercedes-Benz
Service Centre.
Necessary tyre-changing tools may include,
for example:
R jack
R wheel chock
R wheel wrench
Securing the vehicle against rolling
away If your vehicle is equipped with a wheel chock, it
can be found in the tyre-change tool kit
(Y page 345). 370
Changing a wheelWheels and tyres

X
Mount the collapsible emergency spare wheel
as described (Y page 370).
The collapsible emergency spare wheel must
be mounted before it is inflated.
X Remove the tyre inflation compressor from
the stowage space under the luggage com-
partment floor (Y page 345). X
Pull connector ?and hose Bout of the
housing.
X Remove the cap from the valve on the col-
lapsible emergency spare wheel.
X Screw union nut ;of hose Bonto the valve.
X Make sure on/off switch Aof the tyre infla-
tion compressor is set to 0.
X Insert connector ?into a socket in your vehi-
cle.
Cigarette lighter socket: (Y page 323)
12 V sockets: (Y page 324)
Observe the notes on the cigarette lighter
(Y page 323). Observe the notes on sockets
(Y page 324).
X Turn the key to position 1in the ignition lock
(Y page 148).
X Press on and off switch Aon the tyre inflation
compressor to I.
The tyre inflation compressor is switched on.
The tyre is inflated. The tyre pressure is shown
on pressure gauge =.
X Pump the tyre to the specified tyre pressure.
The specified tyre pressure is printed on the
yellow label of the emergency spare wheel.
X When the specified tyre pressure has been
reached, press on and off switch Aon the
electric air pump to 0.
The tyre inflation compressor is switched off.
X Turn the key to position 0in the ignition lock.
X If the tyre pressure is higher than the speci-
fied pressure, press pressure release valve button
:until the correct tyre pressure has
been reached.
X Unscrew union nut ;on hose Bfrom the
valve.
X Screw the valve cap onto the collapsible
emergency spare wheel valve again.
X Stow connector ?and hose Bin the lower
section of the tyre inflation compressor.
X Stow the tyre inflation compressor in the vehi-
cle. 378
Emergency spare wheelWheels and tyres