Drive-off assistant, Flat tire monitor ftm, Te chnology for driving comfort and safe ty – BMW M3 Coupe 2010 User Manual

Page 86

chnology for

driving comfort

and

safe

Activating HDC

Press the button; the LED lights up.
When the vehicle is being braked automatically,
the LED flashes.

Deactivating HDC

Press the button again; the LED goes out.
HDC is automatically deactivated at speeds
greater than approx. 35 mph/60 km/h.

Using HDC

In cars with manual transmission:
Use HDC in lower gears and in reverse gear.
With automatic transmission:
You can use HDC in any drive position.

Displays in the instrument cluster*

1 Display for target speed
2 HDC display

Malfunction

The HDC display disappears during HDC oper-
ation, or does not appear:
HDC is temporarily unavailable due to exces-
sive brake temperature, or DSC has failed.

Drive-off assistant

The drive-off assistant enables you to drive off
smoothly on uphill gradients. It is not necessary
to use the parking brake for this.

Hold the car in place by depressing the
brake.

Release the brake and drive off without
delay.

The drive-off assistant holds the car in
place for approx. 2 seconds after the

brake is released. Drive off without delay after
releasing the brake. Otherwise, the drive-off
assistant will no longer hold the car in place
after approx. 2 seconds and the car will start to
roll backwards.

Flat Tire Monitor FTM*

The concept

The Flat Tire Monitor detects pressure loss in a
tire by comparing the rotating speeds of the
individual tires while moving.
In the event of pressure loss, the rolling circum-
ference changes and, thus, the rotating speed
of the affected wheel. This change is detected
and is reported as a flat tire.

Functional requirement

In order to assure the reliable reporting of a flat
tire, the system must be initialized for the cor-
rect tire inflation pressure.

The system must be reinitialized each
time a tire inflation pressure has been cor-

rected or a wheel or tire has been changed.

System limitations

The Flat Tire Monitor is unable to warn
the driver of sudden, severe tire damage

caused by external factors, nor can it identify
the gradual loss of pressure that will inevitably
occur in all four tires over a lengthy period of
time.

In the following situations, the system could be
delayed or malfunction: