36 Getting startedUnlocking
!
If the SmartKey cannot be turned, the 
battery may not be sufficiently 
charged.
Check the battery and charge it if 
necessary (
page 351).
Get a jump start (
page 354).
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.
Warning!
G
When leaving the vehicle, always remove the 
SmartKey from the starter switch, take it 
with you, and lock the vehicle. Do not leave 
children unattended in the vehicle, or with 
access to an unlocked vehicle. Unsuper-
vised use of vehicle equipment may cause 
an accident and/or serious personal injury. 
279 Operation
Maintenance
Resetting the maintenance service indicator 
In the event that the maintenance service 
on your vehicle is not carried out by an au-
thorized Mercedes-Benz Light Truck 
Center, you can have the maintenance ser-
vice indicator reset. The automotive main-
tenance facility carrying out the 
maintenance service will find the informa-
tion for resetting the maintenance service 
indicator in the maintenance-relevant in-
formation for your vehicle. Such informa-
tion is available from either your 
authorized Mercedes-Benz Light Truck 
Center or directly from Mercedes-Benz.
iIf the battery is disconnected, the days 
of disconnection will not be included in 
the count shown by the maintenance 
service indicator. To arrive at the true 
maintenance service deadline, you will 
need to subtract these days from the 
days shown in the maintenance service 
indicator.
Do not confuse the maintenance ser-
vice indicator with the engine oil level 
indicator :.
iIf the maintenance service indicator 
was inadvertently reset, have an autho-
rized Mercedes-Benz Light Truck 
Center correct it.
Only reset if the proper maintenance 
service has been performed. Resetting 
the system without performing the 
proper maintenance service as called 
for by the maintenance service indica-
tor will result in engine damage and/or 
other vehicle damage not covered by 
the Mercedes-Benz Limited Warranty.