BMW 4 Coupe Series Manual page 336

MOBILITY
General information
The system detects tire pressure loss on the ba‐
sis of rotation speed differences between the in‐
dividual wheels while driving.
In the event of a tire pressure loss, the diameter
and therefore the rotational speed of the corre‐
sponding wheel changes. The difference will be
detected and reported as a flat tire.
The system does not measure the actual infla‐
tion pressure in the tires.
Functional requirements
The following conditions must be met for the
system; otherwise, reliable message of a tire
pressure loss is not assured:
▷ After a tire or wheel replacement, an initializa‐
tion was performed with the correct tire infla‐
tion pressure.
▷ After the tire pressure was adjusted to a new
value, an initialization was performed.
Status display
The current status of the Flat Tire Monitor FTM
can be displayed, for instance whether the FTM
is active.
1. "CAR"
2. "Vehicle status"
3. "Flat Tire Monitor"
The status is displayed.
Initialization required
An initialization must be performed in the follow‐
ing situations:
▷ After the tire inflation pressure has been ad‐
justed.
▷ After a tire or wheel replacement.
Performing initialization
When initializing, the set tire inflation pressures
serve as reference values in order to detect a flat
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Wheels and tires
Online Edition for Part no. 01405A392C9 - VI/21
tire. Initialization is started by confirming the tire
inflation pressures.
Do not initialize the system when driving with tire
chains.
1. "CAR"
2. "Vehicle status"
3. "Flat Tire Monitor"
4. Turn on drive-ready state and do not drive
off.
5. Start the initialization with: "Perform reset"
6. Drive away.
The initialization is completed while driving,
which can be interrupted at any time.
The initialization automatically continues when
driving continues.
Messages
General information
When a flat tire is indicated, DSC Dynamic Sta‐
bility Control is switched on, if needed.
Safety information
Warning
A damaged regular tire with low or missing tire
inflation pressure impacts handling, such as
steering and braking response. Run-flat tires
can maintain limited stability. There is a risk of
accident. Do not continue driving if the vehicle
is equipped with normal tires. Follow the infor‐
mation on run-flat tires and continued driving
with these tires.
Indication of a flat tire
A yellow warning light is illuminated in
the instrument cluster.
In addition, an icon with a Check Control mes‐
sage appears on the Control Display.