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Driving and operating 167
● The driver's door is closed or the
driver's seat belt is fastened.
● The vehicle battery is sufficiently
charged and in good condition.
● The engine is warmed up.
● The engine coolant temperature
is not too high.
● The engine exhaust temperature
is not too high, e.g. after driving
with high engine load.
● The ambient temperature is
above -5 °C.
● The climate control system
allows an Autostop.
● The brake vacuum is sufficient.
● The self-cleaning function of the
diesel particle filter is not active.
● The vehicle was driven at least at
walking speed since the last
Autostop.
Otherwise an Autostop will be
inhibited.
Certain settings of the climate control
system may inhibit an Autostop. See
Climate control chapter for more
details 3 149.
Immediately after motorway driving,
an Autostop may be inhibited.
New vehicle running-in 3 162.
Vehicle battery discharge protection
To ensure reliable engine restarts,
several battery discharge protection
features are implemented as part of
the stop-start system.
Power saving measures
During an Autostop, several electrical
features e.g. auxiliary electric heater
or heated rear window are disabled or
switched to a power saving mode.
The fan speed of the climate control
system is reduced to save power.
Restart of the engine by the driver
Vehicles with manual transmission
Conventional restart
All engines have conventional restart.
Depress the clutch pedal without
depressing the brake pedal to restart
the engine.
On engines with late restart a
conventional restart is only possible
without depressed brake pedal.
Late restart
All engines have late restart in
addition to conventional restart. Late
restart is only active on gradients up
to 5%.
● Depress the brake pedal.
● Depress the clutch pedal.
● Select first gear.
● Release the brake pedal to
restart the engine.
Vehicles with automatic transmission
Release the brake pedal or move
selector lever out of D into N or P to
restart the engine.
Restart of the engine by the stop-
start system
The selector lever must be in neutral
to enable an automatic restart.
If one of the following conditions
occurs during an Autostop, the
engine will be restarted automatically
by the stop-start system:
● The stop-start system is
manually deactivated.
● The bonnet is opened.
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