Tire Pressure Monitor - Mercedes-Benz S-CLASS 2017 Operator's Manual

Checking the tire pressures
Important safety notes
Observe the notes on tire pressure
( page 346).
Y
Information on air pressure for the tires on your
vehicle can be found:
on the vehicle's Tire and Loading Information
R
placard on the B-pillar (
in the tire pressure table in the fuel filler flap
R
( page 162)
Y
in the "Tire pressure" section
R
Checking tire pressures manually
To determine and set the correct tire pressure,
proceed as follows:
Remove the valve cap of the tire that is to be
X
checked.
Press the tire pressure gage securely onto the
X
valve.
Read the tire pressure and compare it to the
X
recommended value on the Tire and Loading
Information placard or the tire pressure table
( page 346).
Y
If the tire pressure is too low, increase the tire
X
pressure to the recommended value.
If the tire pressure is too high, release air. To
X
do so, press down the metal pin in the valve,
using the tip of a pen for example. Then check
the tire pressure again using the tire pressure
checker.
Screw the valve cap onto the valve.
X
Repeat these steps for the other tires.
X

Tire pressure monitor

General notes
If a tire pressure monitor is installed, the vehi-
cle's wheels have sensors that monitor the tire
pressures in all four tires. The tire pressure mon-
itor warns you if the pressure drops in one or
more of the tires. The tire pressure monitor only
functions if the corresponding sensors are
installed in all wheels.
Information on tire pressures is displayed in the
multifunction display. After a few minutes of
driving, the current tire pressure of each tire is
page 353)
Y
menu of the multifunction
shown in the Service
display; see illustration (example).
For information on the message display, refer to
the "Checking the tire pressure electronically"
section ( page 350).
Y
Important safety notes
G
WARNING
Each tire, including the spare (if provided),
should be checked at least once every two
weeks when cold and inflated to the pressure
recommended by the vehicle manufacturer
on the Tire and Loading Information placard
on the driver's door B-pillar or the tire pres-
sure 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
Information placard or, if available, 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 lights up,
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 stopping ability. Please note that
the TPMS is not a substitute for proper tire
maintenance, and it is the driver's responsi-
bility to maintain correct tire pressure, even if
underinflation has not reached the level to
Tire pressure
Z
349