Bmw Z4 sDrive35i 2009 Bedienungsanleitung PDF herunterladen (Seite 83)

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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:

> System has not been initialized

> Driving on snowy or slippery road surface

> Performance-oriented style of driving: slip

in the drive wheels, high lateral acceleration

> Snow chains are attached

Initializing the system

The initialization is completed during driv-

ing, which can be interrupted at any time.

When driving resumes, the initialization is con-

tinued automatically.

Do not initialize the system while snow chains

are attached.<

iDrive, for operating principle refer to page 16.

1. "Vehicle Info"

2. "Vehicle status"

3. "Reset"

4. Start the engine - do not drive away.

5. Start the initialization using "Reset".

6. Start to drive.

The initialization is completed during the trip.

The initialization is completed during driving,

which can be interrupted at any time.

When driving resumes, the initialization is con-

tinued automatically.

Indication of a flat tire

The warning lamps come on in yellow

and red. A message appears on the

Control Display. In addition, an

acoustic signal sounds. There is a flat

tire or substantial loss of tire pressure.

1. Cautiously reduce speed to below 50 mph

or 80 km/h. Avoid sudden braking and

steering maneuvers. Do not exceed a speed

of 50 mph or 80 km/h.

If the car is not equipped with Run-

Flat Tires, refer to page 195, the stan-

dard equipment by design, do not continue

driving. Otherwise a severe accident could

result if you continue driving.<

2. At the next opportunity, check the air pres-

sure in all four tires.

If all four tires are inflated to the cor-

rect pressures, the Flat Tire Monitor

might not have been initialized. The system

must then be initialized.<

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