Manual Mercedes CLA 2015 (page 329 of 362) (English)

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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

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 322). 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 328). 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 322).

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.

Tire pressure

327

Wheels and tires

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Mercedes CLA 2015 Manual

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