2009 PORSCHE BOXSTER Owners Manual

Instruments, On-Board Computer, Warnings
143
fPush operating lever forward.
The stopwatch displays continue the timing.
The on-board computer display returns to the
“Stop timing/Intermediate time” selection. You
can stop the stopwatch or measure an inter-
mediate time. Resetting the time
After timing has been stopped, the on-board com-
puter display changes to the “Continue/Reset” se-
lection.
f
Select “Reset” with the operating lever. f
Push operating lever forward.
The display returns to the “Start timing”
selection.
The stopwatch displays in the instrument panel
and the on-board computer are reset to zero.

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Instruments, On-Board Computer, Warnings
A-Lap
B - Intermediate timeDisplaying intermediate times
Several intermediate time s can be displayed for a
route or for a lap on the race circuit. The interme-
diate times B are for your information.
Measured lap times A can be stored and evaluat-
ed if the vehicle is equipped with Porsche Commu-
nication Management (PCM). After timing has been started, the on-board com-
puter display changes to the “Stop timing/Inter-
mediate time” selection.
f
Select “Intermediate time” with the operating
lever and push the operating lever forwards.
The intermediate time will be displayed for
approx. 5 seconds.

Instruments, On-Board Computer, Warnings
145
The on-board computer display then returns to the
“Stop timing/Intermediate time” selection.
fYou can stop the stopwatch or measure anoth-
er intermediate time. In order to start timing a new lap:
The “New lap?” selectio
n appears for 5 seconds
after selection of “Intermediate time”.
f Select “New lap?” with the operating lever and
push the operating lever forwards. The new lap is displayed on the on-board compu-
ter and the PCM. Timing on the on-board computer
and on the PCM begins from zero. The stopwatch
in the instrument panel continues to show the total
time.

146
Instruments, On-Board Computer, Warnings
f
The on-board computer display returns to the
“Stop timing/Intermediate time” selection after
a short period.
f You can stop the stopwatch or measure anoth-
er intermediate time or a new lap.
AUDIOSwitching on selection field “D”
fPush operating lever forward.
Selecting a radio station
f Select “AUDIO” with the operating lever.
f Push operating lever forward.
f Select the desired station.
f Push the operating lever up or down.
NAVISwitching on selection field “D”
fPush operating lever forward.
Select destination
f Select “NAVI” with the operating lever.
f Push operating lever forward.
f Select the desired function with the operating
lever:
– Last destinations
– Destination memory
–Route guidance

Instruments, On-Board Computer, Warnings
147
TPM
Tire Pressure MonitoringfPlease see the chapter “TIRE PRESSURE FOR
COLD TIRES (68 °F/20 °C)” on Page 277.
The Tire Pressure Monitoring continuously
monitors tire pressure and tire temperature on all
four wheels and warns the driver when the tire
pressure is too low.
The display as well as the settings for the Tire
Pressure Monitoring take place on the on-board
computer.
However, you must still adjust the tire pressure on
the wheel. f
The driver is responsible for filling the tires
correctly and making the correct settings on
the on-board computer.
The Tire Pressure Monitoring offers the following
functions:
– Display of the actual ti re pressure while the
vehicle is in motion.
– Display of the deviation from the required pressure (refilling pressure).
– Display of currently set tire size and type.
– Tire pressure warnings in two stages.
Warning!
f Despite the advantages offered by the Tire
Pressure Monitoring, it is still the driver’s re-
sponsibility to update the corresponding set-
tings in the on-board computer and maintain
the pressure in the tires.
Low tire pressure reduces the road safety of
the vehicle and destroys the tire and wheel.
f When a flat tire has been displayed, immedi-
ately stop in a suitable place and check the
tires for damage. If necessary, remedy the
damage with a tire sealant.
f Do not by any means continue to drive with
damaged tires.
f Sealing the tire with tire sealant is only an
emergency repair, so you can drive to the next
authorized Porsche dealer. The maximum per-
mitted speed is 50 mph (80 km/h). f
Do not drive with tires whose tire pressure
drops again in a short period of time. In cases
of doubt, have tires checked by an authorized
Porsche dealer.
f Damaged tires must be immediately replaced
by an authorized Porsche dealer.
Tire repairs are not permissible under any
circumstances.
f If a fault occurs in the Tire Pressure Monitoring
(e.g. defective wheel tr ansmitter), contact an
authorized Porsche dealer immediately and
have the damage repaired.
The tire pressure will not be monitored at all or
will be monitored only partially by defective
Tire Pressure Monitoring.
f Tires lose air over time without a tire defect
being present. A tire pressure warning will then
appear in the on-board computer display.
Correct the tire pressure at the next oppor-
tunity.
f The Tire Pressure Monitoring gives a warning
about tire damage due to natural pressure loss
as well as about a gradual loss of pressure due
to foreign objects.
The Tire Pressure Mnitoring cannot warn you
about tire damage that occurs suddenly (e.g.
flat tire due to abrupt external effects).

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Instruments, On-Board Computer, Warnings
Tire pressure function of the on-board
computer
The tire pressure function of the on-board
computer
displays the tire pressures (actual
pressure) dependent on temperature in the four
wheels.
You can watch the tire pressure rise as the
temperature increases while driving.
This display is only for information.
f Under no circumstances should the tire
pressures be changed based on this display.
Warning!
This display is for informational purposes
only. Under no circumsta nces should the tire
pressures be changed based on this display.
Changing the tire pressure to incorrect
pressures could adversely affect the perfor-
mance, driving character istics, and safety of
your vehicle.
f Maintain tire pressures according to the units
indicated on the tire pressure plate, located on the drivers side door of the vehicle.
Displaying the tire pressure function of the
on-board computer
f Push operating lever up or down until the tire
pressure function of the on-board computer
appears.
(The selection field must be switched off.)Pressure info in tire pressure menu
In accordance with physical principles, the air
pressure changes as the temperature changes.
The tire pressure increases or decreases by
around 1.5 psi (0.1 bar) for every 18 °F (10 °C)
change in temperature.
The Tire Pressure Monitoring takes this relation-
ship between tire pressure and temperature into
account.
f
Please see the chapter “PRESSURE INCREASE
AS THE RESULT OF TEMPERATURE
INCREASE” on Page 156.
You can read the tire pressures to be
corrected in this display.

Instruments, On-Board Computer, Warnings
149
The tire pressure to be corrected (refill pressure)
is indicated on the displayed wheel.
Example: If “ –1.5 psi (–0.1 bar)” is displayed,
1.5 psi (0.1 bar) must be added to this tire.
Note
The tire pressure menu can only be called up when
the vehicle is stationary.
Calling up the “Info pressure” display
fPush operating lever forward in order to switch
on the selection field.
f Select “TPM” with the operating lever.
f Push operating lever forward.
The display changes to the tire pressure menu.
f Select “Info pressure” with the operating lever.
f Push operating lever forward.
Note
After the ignition is switch ed on, it can take up to
approx. 1 minute before all tire pressures are
displayed. Dashes (“-.-”) appear instead of the tire
pressures. Tire type info in Tire pressure menu
Information about the currently set tires:
– Tire type: Summer tires, winter tires
– Tire size: 17, 18, 19 inch
“Info tires” shows the current tire settings.
Calling up the “Info tires” display
f
Push operating lever forward in order to switch
on the selection field.
f Select “TPM” with the operating lever.
f Push operating lever forward.
The display changes to the tire pressure menu. f
Select “Info tires” with the operating lever.
f Push operating lever forward.
Tire selection in the “Set” menu
f Push operating lever forward in order to switch
on the selection field.
f Select “TPM” with the operating lever.

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Instruments, On-Board Computer, Warnings
f
Push operating lever forward.
The display changes to the tire pressure menu. f
Select “Set” with the operating lever. fPush the operating lever forward.
f Select desired tire type:
summer or winter.
f Push operating lever forward.
A display for confirming the selected type of
tire appears.