reset MERCEDES-BENZ S-Class 2012 W221 Service Manual

:Digital speedometer
Resetting values
You can reset the values of the following
functions:
R Trip odometer
R Trip computer "From start"
R Trip computer "From reset"
XPress the = or ; button on the
steering wheel to select the Trip menu.XPress the 9 or : button to select the
function that you wish to reset.XPress a.
Resetting the trip odometer (example)
XPress : to select Yes and press a
to confirm.
Navigation menu
Displaying navigation instructions
In the Navi menu, the multifunction display
shows navigation instructions. Further
information ( Y page 150).
XActivate COMAND ( Y page 133).XPress the = or ; button on the
steering wheel to select the Navi menu.Route guidance inactive:Direction of travel;Current road
Route guidance active
No change of direction announced
:Distance to the destination;Symbol for "follow the road's course"=Distance to the next change of direction?Current road
Change of direction announced without a
lane recommendation
:Road into which the change of direction
leads;Symbol for change of direction=Distance to change of direction and visual
distance display
When a change of direction has been
announced, you will see visual distance
Menus and submenus377On-board computer and displaysZ

XPress the X button on the steering
wheel to show the intermediate time during
timing.
The intermediate time is displayed for five
seconds.XPress the X button again within five
seconds.
The displayed intermediate time is stored
as a lap time.
Timing starts for a new lap. The new lap is
timed from when the intermediate time is
called up.:Gear indicator;RACETIMER=Fastest lap time (best lap)
Resetting the current lap
XPress the W button on the steering
wheel to stop the RACETIMER.XPress X to reset the lap time to "0”.
Deleting all laps
You cannot delete individual stored laps.
XPress the W button on the steering
wheel to stop the RACETIMER.XPress and hold the X button for a
minimum of three seconds.XPress the W button to start the
RACETIMER.
All laps are deleted.
or
XPress the W button on the steering
wheel to stop the RACETIMER.XPress the a button.
Reset Race Timer appears in the
multifunction display.XPress the : button to select Yes and
press the a button to confirm.
All laps are deleted.
Overall evaluation
This function is shown if you have stored at
least one lap and stopped the RACETIMER.
XPress = or ; on the steering wheel
to select the AMG menu.XPress the 9 button repeatedly until the
overall evaluation is shown.:RACETIMER overall evaluation;Total time driven=Top speed?Distance coveredAAverage speedMenus and submenus381On-board computer and displaysZ

The brake fluid level is correct if it is between
MIN marking ; and MAX marking : on the
brake fluid reservoir.
Maintenance
Service interval display
Service messages
Information on the type of service and service
intervals (see separate Service Booklet).
You can obtain further information from an
authorized Mercedes-Benz Center or at
http://www.mbusa.com (USA only).
The service interval display informs you of the
next service due date.
If a service due date has been exceeded, you
also hear an acoustic signal.
The multifunction display shows a service
message for a few seconds, e.g.
Next service A due in .. days
Service A due
Service A overdue by .. days
The letter indicates how much time the
workshop will require to carry out the service
work. The letters displayed range from A for
a short service duration to H for a long service
duration.
The service interval display does not take into
account any periods of time during which the
battery is disconnected.
Maintaining the time-dependent service
schedule:XNote down the service due date displayed
in the multifunction display before
disconnecting the battery.
or
XSubtract the battery disconnection periods
from the service date shown on the display
after reconnecting the battery.
i The service interval display does not
provide any information regarding the
engine's oil level. Observe the notes on the
engine oil level ( Y page 457).
Hiding a service message
XPress the % or a button on the
steering wheel.
Displaying service messages
XSwitch on the ignition.XPress = or ; on the steering wheel
to select the Service menu.XPress 9 or : to select the ASSYST
PLUS submenu and press a to confirm.
The service due date appears in the
multifunction display.
Please bear the following in mind
Resetting service interval display
If the qualified specialist workshop, e.g. a
Mercedes-Benz Center, carried out the
maintenance work, the service interval
display will be reset.
Further information, on maintenance for
example, can be obtained at an authorized
Mercedes-Benz Center or directly from
Mercedes-Benz.
! If the service interval display has been
reset unintentionally, have the setting
corrected at a Mercedes-Benz Center.
Have service work carried out as described
in the Service Booklet. This may otherwise
462MaintenanceMaintenance and care

If the tire pressures have been set to the
lower values for lighter loads and/or lower
road speeds, the pressures should be reset
to the higher values:
R if you want to drive with an increased load
and/or
R if you want to drive at higher road speeds.
i The tire pressures for increased loads
and/or higher road speeds, shown in the
tire pressure table, may have a negative
effect on driving comfort.
Option 3) The tire pressure for the
emergency/collapsible spare wheel
(depending on vehicle equipment) can be
found:
R printed in yellow on the rim of the
emergency/collapsible spare wheel
R in the "Wheel and tire combinations"
section ( Y page 514) in this manual
R on the Tire and Loading Information placard
on the B-pillar on the driver's side.
If the tire pressure is not set correctly, this
can lead to an excessive build up of heat and
a sudden loss of pressure.
For further information, consult a qualified
specialist workshop, e.g. an authorized
Mercedes-Benz Center.
Important notes on tire pressureGWARNING
Should the tire pressure drop repeatedly:
R check the tire for foreign bodies.
R check whether the wheel is losing air or the
valve is leaking.
R make sure that only a valve cap approved
by Mercedes-Benz is used on the tire valve.
Tire pressures that are too low have a
negative effect on vehicle safety, which could
lead you to cause an accident.
To test tire pressure, use a suitable tire
pressure gauge. The outer appearance of a
tire does not permit any reliable conclusion
about the tire pressure. On vehicles equipped
with the electronic tire pressure monitoring
system, the tire pressure can be checked
using the on-board computer.
The tire temperature and pressure increase
when the vehicle is in motion. This is
dependent on the driving speed and the load.
Therefore, you should only correct tire
pressures when the tires are cold.
The tires are cold:
R if the vehicle has been parked without
direct sunlight on the tires for at least three
hours and
R if the vehicle has not been driven more than
1 mile (1.6 km).
The tire temperature changes depending on
the outside temperature, the vehicle speed
and the tire load. If the tire temperature
changes by 18 ‡ (10 † ), the tire pressure
changes by approximately 10 kPa (0.1 bar/
1.5 psi). Take this into account when
checking the pressure of warm tires and only
correct the tire pressure if it is too low for the
current operating conditions. If you check the
tire pressure when the tires are warm, the
resulting value will be higher than if the tires
were cold. This is normal. Do not reduce the
tire pressure to the value specified for cold
tires. The tire pressure would otherwise be
too low.
Tire pressure495Wheels and tiresZ