Volvo S80 Owner's Manual page 247

06 Maintenance and specifications
Wheels and tyres
Tread depth
Road conditions with ice, slush and low tem-
peratures place considerably higher demands
on tyres than summer conditions. Volvo there-
fore recommends not to drive on winter tyres
that have a tread depth of less than 4 millime-
tres.
Using snow chains
Snow chains may only be used on the front
wheels (also applies to all-wheel drive cars).
Never drive faster than 50 km/h with snow
chains. Avoid driving on bare ground as this
wears out both the snow chains and tyres.
Never use quick-fit snow chains as the space
between the brake discs and the wheels is too
small.
IMPORTANT
06
Use Volvo genuine snow chains or equiva-
lent chains designed for the car model, and
tyre and rim dimensions. Consult an author-
ised Volvo workshop
Tyre pressure monitoring, TPMS*
TPMS (Tyre Pressure Monitoring System)
warns the driver when the pressure is too low
in one or more of the car's tyres. It uses sensors
located inside the air valve in each wheel.
*
246
Option/accessory, for more information, see Introduction.
When the car is driven at about 40 km/h the
system detects the tyre pressure. If the pres-
sure is too low then a warning lamp on the
instrument panel illuminates and a message is
shown on the display.
Always check the system after changing a
wheel in order to ensure that replacement
wheels work with the system.
For information on correct tyre pressure, see
page 254.
The system does not replace normal tyre main-
tenance.
IMPORTANT
If a fault should arise in the tyre pressure
system a warning lamp on the instrument
panel will illuminate. The message
PRESS. SYST SERVICE REQUIRED
be shown. This can be for various reasons,
e.g. fitting a wheel not equipped with a sen-
sor adapted for Volvo's tyre pressure moni-
toring system.
Adjusting tyre pressure monitoring
Tyre pressure monitoring can be adjusted in
order to follow Volvo's tyre pressure recom-
mendations, when driving with a heavy load for
example.
NOTE
The engine must not be running.
Settings are made in the controls in the centre
console, see page 116.
1. Inflate the tyres to the required pressure
and select key position I or II.
2. Select
Car settings
3. Select Calibrate tyre pressure
4. Press ENTER.
5. Drive the car at least at 40 km/h in total for
at least 1 minute.
Rectifying low tyre pressure
When the message
TYRE
CHECK TYRES
will
1. Check the tyre pressure in all four tyres.
2. Inflate the tyre(s) to the correct pressure.
3. Drive the car at least at 40 km/h in total for
at least 1 minute and check that the mes-
sage disappears.
Tyre pressure
.
LOW TYRE PRESS
is shown on the display