BMW X3 M Owner's Manual page 333

Do not initialize the Flat Tire Monitor after
mounting tire chains, as doing so may result in
incorrect readings.
Do not reset the Tire Pressure Monitor after
mounting tire chains, as doing so may result in
incorrect readings.
When driving with tire chains, briefly activate Dy‐
namic Traction Control DTC to optimize the
drive power.
Maximum speed with tire chains
Do not exceed a speed of 30 mph/50 km/h when
using tire chains.
Tire pressure monitor
Principle
The Tire Pressure Monitor monitors the tire
pressure and issues a warning if the tire pressure
has dropped.
General information
Sensors in the tire valves measure the tire infla‐
tion pressure and tire temperature.
Using the tire settings in iDrive, the system can
automatically compare the predefined target
pressures with the actual tire inflation pressures.
If tires are being used that are not specified on
the tire inflation pressure details on the vehicle,
such as tires with special approval, the system
needs to be actively reset. The system will then
take over the actual tire inflation pressures as the
target pressures.
When operating the system, also note the infor‐
mation found in the Tire inflation pressure chap‐
ter.
Additional information:
Tire inflation pressure, refer to page 320.
Online Edition for Part no. 01405A37822 - VI/21
Wheels and tires
Safety information
Warning
Incorrect entries in the tire settings can lead to
incorrect target tire inflation pressure values. In
this case, it cannot be guaranteed that the noti‐
fication of a tire pressure loss will be reliable.
There is a risk of injury and risk of damage to
property. Ensure that the tire sizes of the
mounted tires are displayed correctly and
match the details on the tires and on the vehi‐
cle.
Functional requirements
The following conditions must be met for the
system; otherwise, reliable message of a tire
pressure loss is not assured:
▷ Every time a tire or wheel is changed, the
correct details on the mounted tires must be
entered in the tire settings.
▷ The Tire Pressure Monitor does not activate
until after driving for a few minutes:
▷ After a tire or wheel replacement.
▷ After a reset, for tires with special appro‐
val.
▷ After changing the tire setting.
▷ For tires with special approval:
▷ After a tire or wheel replacement, a reset
was performed with the correct tire infla‐
tion pressure.
▷ After the tire inflation pressure was ad‐
justed to a new value, a reset was per‐
formed.
▷ Wheels with wheel electronics.
Tire settings
General information
The tire sizes of the mounted tires can be gath‐
ered from the tire inflation pressure details on the
vehicle or directly on the tires.
MOBILITY
333