Wheels and tires, Tire pressure – Mercedes-Benz C-Coupe 2015 Owners Manual User Manual

Page 312

vehicle has tires of a different size than the

size indicated on the Tire and Loading Infor-

mation placard or 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 illuminates,

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 stop-

ping ability.
Please note that the TPMS is not a substitute

for proper tire maintenance, and it is the driv-

er's responsibility to maintain correct tire

pressure, even if underinflation has not

reached the level to trigger illumination of the

TPMS low tire pressure telltale.
Your vehicle has also been equipped with a

TPMS malfunction indicator to indicate if the

system is not operating properly. The TPMS

malfunction indicator is combined with the

low tire pressure telltale. When the system

detects a malfunction, the warning lamp will

flash for approximately a minute and then

remain continuously illuminated. This

sequence will be repeated every time the vehi-

cle is started as long as the malfunction

exists.
When the malfunction indicator is illuminated,

the system may not be able to detect or signal

low tire pressure as intended. TPMS malfunc-

tions may occur for a variety of reasons,

including the installation of incompatible

replacement or alternate tires or wheels on

the vehicle that prevent the TPMS from func-

tioning properly. Always check the TPMS mal-

function telltale after replacing one or more

tires or wheels on your vehicle to ensure that

the replacement or alternate tires and wheels

allow the TPMS to continue to function prop-

erly.

It is the driver's responsibility to set the tire

pressure to that recommended for cold tires

which is suitable for the operating situation

(

page 306). Note that the correct tire pres-

sure for the current operating situation must

first be taught-in to the tire pressure monitor.

If there is a substantial loss of pressure, the

warning threshold for the warning message is

aligned to the reference values taught-in.

Restart the tire pressure monitor after adjust-

ing the pressure of the cold tires

(

page 311). The current pressures are

saved as new reference values. As a result, a

warning message will appear if the tire pres-

sure drops significantly.
The tire pressure monitor does not warn you

of an incorrectly set tire pressure. Observe

the notes on the recommended tire pressure

(

page 306).

The tire pressure monitor is not able to warn

you of a sudden loss of pressure, e.g. if the

tire is penetrated by a foreign object. In the

event of a sudden loss of pressure, bring the

vehicle to a halt by braking carefully. Avoid

abrupt steering maneuvers.
The tire pressure monitor has a yellow warn-

ing lamp in the instrument cluster for indicat-

ing a pressure loss or malfunction. Whether

the warning lamp flashes or lights up indi-

cates whether a tire pressure is too low or the

tire pressure monitor is malfunctioning:

if the warning lamp is lit continuously, the

tire pressure on one or more tires is signif-

icantly too low. The tire pressure monitor is

not malfunctioning.

if the warning lamp flashes for around a

minute and then remains lit constantly, the

tire pressure monitor is malfunctioning.

In addition to the warning lamp, a mes-

sage appears in the multifunction display.
Further information can be found on

(

page 228).

310

Tire pressure

Wheels

and

tires