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 once 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 RPA, for example to check
whether the RPA is active.
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
Initialisation saves the set tyre inflation pressures
as reference values for subsequent 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.
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.
Initialising resumes automatically when you con‐
tinue your journey.
Messages
General
Dynamic Stability Control DSC is activated if
necessary as soon as the message for a flat tyre
appears.
Safety note
WARNING
A damaged standard tyre with too little or no
tyre inflation pressure impairs driving character‐
istics, for example steering and braking. Tyres
with run-flat properties allow a limited level of
stability to be maintained. There is a risk of ac‐
cident. Do not continue driving if the vehicle is
fitted with standard tyres. Comply with the
notes on run-flat tyres and continuing to drive
with these tyres.
Seite 386
MOBILITY
Wheels and tyres
386
Online Edition for Part no. 01405A1EA53 - X/20
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