84
Tyre pressure control (RDC)*
The principle
RDC monitors tyre pressures at all four
wheels, both at a standstill and when
the car is being driven. The system
reports any sudden loss of pressure in
one or more tyres.
To enable the system to "recognise" the
correct tyre pressures, first compare
these with the specified values in the
table, see page 24, and correct them if
necessary. Then activate the system.
This warning light in the instru-
ment cluster tells you if the tyre
pressure departs from the cor-
rect value.
Initialising the system
1. Turn the ignition key to position 2,
but do not start the engine
2. Keep the button pressed until the
telltale light on the instrument panel
remains on for several seconds
3. After the car has been driven for sev-
eral minutes, the RDC system
accepts the current tyre pressures as
the nominal values which it is to
monitor.
Do not repeat this process until you
have corrected the tyre pressure. Oth-
erwise RDC remains automatically in
ignition key position 2 and therefore
operates during every journey.
If there is a loss of tyre pressure
If tyre pressure sinks significantly after a
period (this is perfectly normal in all
tyres), the yellow telltale light comes on.
This is to remind you that the tyre pres-
sure should be corrected to the speci-
fied value again as soon as possible.
If you are asked by the system to
check tyre pressures shortly after
correcting them, the corrected pressure
values were not plausible. Please check
the tyre pressures again and correct
them to the values specified in the tyre
pressure table. After this, reactivate the
system.
<
With a burst tyre
If a puncture or similar tyre failure
occurs, and pressure drops suddenly,
the red warning light comes on. In addi-
tion a warning signal is heard.
Immediately reduce speed and stop at
the first safe opportunity. Avoid pro-
nounced braking and steering manoeu-
vres while doing so. Change the defec-
tive wheel with its tyre, see page 139.
handbook.book Page 84 Thursday, December 19, 2002 4:29 PM
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