out, for example, a flat tyre is reported in spite of
the correct tyre pressure.
Malfunction
Message
The yellow warning lamp flashes and is
then illuminated continuously. A Check
Control message is shown. Tyre pres‐
sure losses may not be detected.
Measure
▷ A wheel without TPM wheel electronics is fit‐
ted, for example emergency wheel: have the
wheels checked if necessary.
▷ Fault due to systems or devices with the
same radio frequency: the system is auto‐
matically reactivated upon leaving the field of
interference.
▷ In the case of tyres with special approval: the
system was unable to complete the reset.
Perform a system reset again.
Malfunction: have the system checked.
Runflat indicator RPA
Principle
The system identifies a loss of tyre inflation pres‐
sure by comparing the rotational speeds of the
individual wheels during the journey.
If a tyre loses inflation pressure, its diameter
changes. This in turn alters the rotational speed
of the corresponding wheel. The discrepancy will
be detected and reported as a flat tyre.
The system does not measure the tyre inflation
pressure as such.
Operating requirements
The following requirements must be met for the
system, otherwise reliable signalling of a loss of
tyre inflation pressure is not ensured:
▷ After every tyre or wheel change, an initialisa‐
tion must be carried out when the tyre infla‐
tion pressures are correct.
▷ An initialisation must be carried out after the
tyre inflation pressure has been adjusted to a
new value.
Status display
It is possible to display the current status of the
runflat indicator, for example to check whether
the RPA is active.
Via iDrive:
1.
"CAR"
2. "Vehicle status"
3. "Flat Tyre Monitor"
The status is displayed.
Initialisation required
An initialisation must be performed in the
following situations:
▷ After adjusting the tyre inflation pressure.
▷ After a tyre or wheel change.
Initialising
On initialisation, the current tyre pressures are
saved as a reference for detection of a flat tyre.
Initialisation is started by confirming the correct
tyre inflation pressures.
When driving with snow chains fitted, do not initi‐
alise the system.
Via iDrive:
1.
"CAR"
2. "Vehicle status"
3. "Flat Tyre Monitor"
4. Switch on drive-ready state but do not drive
off.
5. Start the initialisation: "Perform reset"
6. Drive off.
Initialisation is completed during the journey; this
process can be interrupted at any time.
Seite 353
Wheels and tyres
MOBILITY
353
Online Edition for Part no. xxx - VI/19
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