BMW M5 Owner's Handbook Manual page 72

You can also activate your preferred program
via the button on the steering wheel, see
MDrive on page 43.
Run Flat Indicator RPA
The principle
The Run Flat Indicator monitors the pressures
in the four tyres fitted to the road wheels while
the car is being driven. The system reports any
significant loss of pressure in one tyre in rela-
tion to the others.
In the event of a loss of pressure, the operating
radius and therefore the rotational speed of the
wheels change. This change is detected and
reported as tyre failure.
Operating requirements
To ensure that tyre failure can be reported reli-
ably, the system must have been initialised
while the tyre pressures are correct.
The system has to be reinitialised every
time tyre pressures are corrected, after
each change of a wheel or tyre, and after a trailer
has been attached or detached.<
System limits
The Run Flat Indicator is unable to warn
the driver of sudden, severe tyre damage
caused by external factors, nor can it identify
the gradual loss of pressure that will inevitably
occur in all four tyres over a lengthy period of
time.<
In the following situations, the system could be
slow to respond or operate incorrectly:
> If the system has not been initialised
> When driving on snow-covered or slippery
surfaces
>
When driving with an enthusiastic style,
causing the driven wheels to spin, high lat-
eral acceleration
> When driving with snow chains
Online Edition for Part-No. 01 41 0 159 168 © 03/05 BMW AG
Initialising the system
Initialising is completed by driving the car;
this process can be interrupted at any
time. Initialising resumes automatically when
you continue your journey. Do not initialise the
system while driving with snow chains
Via the button in the centre console:
1. Start the engine but do not drive off yet.
2. Press the button for at least 4 seconds but
for no longer than 2 minutes. After the but-
ton is released, the warning light in the
instrument cluster comes on yellow for a
few seconds. Warning light, see Indication
of a flat tyre. The message "RPA Initialis-
ierung..." appears on the control display for
a few seconds.
3. Drive off. Initialising is completed during the
journey, without confirmation being pro-
vided.
iDrive, operating principle, see page 14:
1. Press the
The start menu is called up.
2. Press the controller to call up the menu.
*
3. Select "Vehicle settings" and press the
controller.
fitted.<
button.
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