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Wh eels and tire s, Check – Mercedes-Benz C-Sedan 2015 Owners Manual User Manual

Page 368

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underinflation has not reached the level to

trigger illumination of the TPMS low tire pres-

sure telltale.
Your vehicle has also been equipped with a

TPMS malfunction indicator to indicate when

the system is not operating properly. The

TPMS malfunction indicator is combined with

the low tire pressure telltale. When the sys-

tem 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 illu-

minated, the system may not be able to detect

or signal low tire pressure as intended.
TPMS malfunctions may occur for a variety of

reasons, including the installation of incom-

patible replacement or alternate tires or

wheels on the vehicle that prevent the TPMS

from functioning properly. Always check the

TPMS malfunction 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 properly.

It is the driver's responsibility to set the tire

pressure to that recommended for cold tires

which is suitable for the operating situation

(

Y

page 361). 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

(

Y

page 367). 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

(

Y

page 361).

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:

R

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.

R

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 message

appears in the multifunction display. Further

information can be found on (

Y

page 277).

If the tire pressure monitor is malfunctioning,

it may take more than ten minutes for the tire

pressure warning lamp to inform you of the

malfunction by flashing for approximately one

minute and then remaining lit. When the mal-

function has been rectified, the tire pressure

warning lamp goes out after a few minutes of

driving.
The tire pressure values indicated by the on-

board computer may differ from those meas-

ured at a gas station with a pressure gauge.

The tire pressures shown by the on-board

computer refer to those measured at sea

level. At high altitudes, the tire pressure val-

ues indicated by a pressure gauge are higher

than those shown by the on-board computer.

In this case, do not reduce the tire pressures.
The operation of the tire pressure monitor can

be affected by interference from radio trans-

mitting equipment (e.g. radio headphones,

two-way radios) that may be being operated

in or near the vehicle.

366

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eels

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