Do not initialize the run-flat tires after mounting
snow chains, as doing so may result in incorrect
Do not reset the Tire Pressure Monitor TPM af‐
ter mounting snow chains, as doing so may re‐
sult in incorrect readings.
When driving with snow chains, briefly activate
Dynamic Traction Control DTC to optimize the
Maximum speed with snow
Do not exceed a speed of 30 mph/50 km/h when
using snow chains.
Tire Pressure Monitor TPM
The system monitors tire inflation pressure in the
four mounted tires. The system warns you if
there is a loss of pressure in one or more tires.
Sensors in the tire valves measure the tire infla‐
tion pressure and tire temperature.
Using the tire settings in iDrive, the system can
automatically display the specified target pres‐
sures and compare them with the actual tire in‐
If tires are being used that are not specified on
the tire inflation pressure details on the vehicle,
refer to page 296, such as tires with special ap‐
proval, the system needs to be actively reset.
The system will then take over the actual tire in‐
flation pressures as the target pressures.
When operating the system, also note the addi‐
tional information found in the Tire inflation pres‐
sure, refer to page 296, chapter.
The display of the target pressures is not a
substitute for the tire inflation pressure details
on the vehicle. Incorrect entries in the tire set‐
tings can lead to incorrect target tire inflation
pressure values. In this case, it cannot be guar‐
anteed that the notification of a loss of tire infla‐
tion pressure 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 dis‐
played correctly and match the details on the
tires and on the vehicle.
The following conditions must be met for the
system; otherwise, reliable flagging of a loss of
tire inflation pressure 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, refer to
▷ For tires with special approval:
▷ After a tire or wheel replacement, a reset
was performed with the correct tire infla‐
▷ After the tire inflation pressure was ad‐
justed to a new value, a reset was per‐
▷ Wheels with TPM wheel electronics.
The tire sizes of the mounted tires can be gath‐
ered from the tire inflation pressure details on the
vehicle, refer to page 296, or directly on the tires.
The tire details do not need to be re-entered
when the tire inflation pressure is corrected.
For summer and winter tires, the tire details en‐
tered last are stored. After a tire or wheel re‐
Wheels and tires
Online Edition for Part no. 01402896703 - X/18