31 Getting started
Unlocking
Starter switch positionsStarter switch0For removing SmartKey 
The steering is locked when the Smart-
Key is removed from the starter switch. 
If necessary, move steering wheel 
slightly to allow the locking mechanism 
to engage.
1Power supply to some electrical con-
sumers, such as seat adjustment
2Ignition (power supply for all electrical 
consumers) and driving position
3Starting position
Warning!
G
When leaving the vehicle, always remove the 
SmartKey from the starter switch and lock 
the vehicle. Do not leave children unattend-
ed in the vehicle, or with access to an un-
locked vehicle. Unsupervised use of vehicle 
equipment may cause an accident and/or 
serious personal injury.iVehicles with automatic transmission: 
The SmartKey can only be removed 
from the starter switch with the gear 
selector lever in positionP.
!If the SmartKey cannot be turned in the 
starter switch, the battery may not be 
sufficiently charged.
Check the battery and charge it if 
necessary (
page 307).
Get a jump start (
page 310).
To prevent accelerated battery dis-
charge and a possible dead battery, al-
ways remove the SmartKey from the 
starter switch when the engine is not in 
operation. 
250 OperationMaintenanceThe Mercedes-Benz Center will reset the 
service indicator following a completed 
service.Calling up the service indicator
Switch ignition on.
The standard display of the control sys-
tem appears (
page 109).
Press button k or j on the mul-
tifunction steering wheel until the FSS 
indicator appears in the multifunction 
display.
Resetting the service indicator
In the event that the service on your vehi-
cle is not carried out by an authorized 
Mercedes-Benz Center, you can reset the 
service indicator yourself.
Switch on ignition.
The standard display of the control sys-
tem appears (
page 109).
Press button k or j on the mul-
tifunction steering wheel until the FSS 
indicator appears in the multifunction 
display.
Press the reset button for about 
four seconds.
This message appears in the multifunc-
tion display:SERVICE INTERVAL? RESET WITH R 
BUTTON FOR 3 SEC.
To confirm, hold down the reset button 
for about four seconds.
The service indicator now displays the 
reset interval.
iIf the battery is disconnected, the days 
of disconnection will not be included in 
the count shown by the service indica-
tor. To arrive at the true service dead-
line, you will need to subtract these 
days from the days shown in the ser-
vice indicator.
Do not confuse the service indicator 
with the engine oil level indicator :.
iIf the service indicator was inadvertent-
ly reset, have a Mercedes-Benz Center 
correct it.
Only reset if the proper service has 
been performed. Resetting the system 
without performing the proper service 
as called for by the FSS will cause the 
FSS to incorrectly determine the next 
service interval which will result in en-
gine damage not covered by the 
Mercedes-Benz Limited Warranty.