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Runflat Indicator*
The principle
The Runflat Indicator system monitors
tyre pressures at all four road wheels
when the car is being driven. The sys-
tem reports any sudden, significant loss
of pressure in one tyre in relation to the
others.
Tyre pressures are monitored by meter-
ing the relative speeds of the four
wheels. If these relative speeds diverge
from certain ratios the system interprets
this deviation as a puncture and reacts
accordingly.
System requirements
The procedure outlined below has to be
adopted in order to teach the Runflat
Indicator to recognise the correct tyre
pressures:
1. Check the pressures of all the tyres
and correct as necessary, see
page 24
2. Initialise the system.
System limitations
The Runflat Indicator is unable to
provide advance warning of seri-
ous, sudden tyre damage due to exter-
nal influences and is unable to detect
the natural, gradual and uniform loss of
pressure in all four tyres.<
In the following situations, recognition
of tyre-pressure loss might be delayed,
or the system may even be rendered
non-operational:
>When the car is driven on snow-cov-
ered roads or slippery surfaces
>If your style of driving is sporty: slip at
the drive wheels, high lateral acceler-
ation
>When snow chains are fitted to the
wheels, the system could issue false
alarms or fail to detect a deflated tyre
>The Runflat Indicator cannot function
when you drive with the compact
spare wheel fitted.
Initialising the system
Always reinitialise the system
immediately after correcting tyre
pressures, changing a tyre, or fitting
new wheels. The procedure requires
driving the car over a certain distance.<
1. Start the engine, but do not drive off
just yet
2. Press and hold down the button, but
not for longer than 10 seconds at a
time, until the yellow telltale light in
the instrument cluster lights up for a
few seconds
3. Drive off.
It takes a few minutes before the Run-
flat Indicator is able to detect and
report deflated tyres.
Online Edition for Part-No. 01 41 0 158 017 - © 03/04 BMW AG