The last selected program is active each time
the engine is started.
You can also activate your preferred program
with the button on the steering wheel, refer
to MDrive on page

FTM Flat Tire Monitor*

The concept

The Flat Tire Monitor detects a pressure loss in
one tire by comparing the speeds of the individ-
ual wheels during driving.

In the event of a pressure loss, there is a change
in the rolling circumference and therefore the
rotation speed of the corresponding wheel. The
system detects this change and reports it as a
flat tire.

Functional requirement

To ensure the reliable signaling of a flat tire, the
system must be initialized at the correct tire
inflation pressure.

The initialization must be repeated after
every correction of the tire inflation pres-

sure and after every tire or wheel change.

System limits

The Flat Tire Monitor cannot indicate sudden
severe tire damage caused by outside factors
and does not detect a natural, even pressure
drop in all four tires.
In the following situations, the system could be
delayed or malfunction:

System has not been initialized

Driving on snowy or slippery road surface

Sporty driving style: slip in the drive wheels,
high lateral acceleration

Driving with snow chains

Initializing system

The initialization finishes during driving,
which can be interrupted at any time.

When driving resumes, the initialization is con-
tinued automatically. The system is initialized
after this activation phase. The system is not
initialized when traveling with snow chains

With Sequential Manual Transmission via the
button in the center console:

Start the engine, but do not start driving.

Press the button for approx. 5 seconds.
After the button is released, the warning
lamp lights up in yellow for several seconds
in the instrument cluster, refer to Message
with low tire inflation pressure The mes-