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Driving and operating 139
● The engine exhaust temperature
is not too high, e.g. after driving
with high engine load.
● The ambient temperature is
sufficient.
● The climate control system
allows an Autostop.
● The brake vacuum is sufficient.
● The self-cleaning function of the
diesel particle filter is not active.
Otherwise an Autostop will be
inhibited.
Certain settings of the climate control
system may inhibit an Autostop. See
Climate control chapter for more
details 3 121.
If an autostop is temporarily not
available, D flashes green 3 95.
Immediately after driving at a higher
speed an Autostop may be inhibited.
New vehicle running-in 3 133.
Vehicle battery discharge protection
To ensure reliable engine restarts,
several vehicle battery discharge
protection features are implemented
as part of the stop-start system.
Power saving measures
During an Autostop, several electrical
features such as auxiliary electric
heater or rear window heating 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.
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 driver's seat belt is
unfastened or the driver's door is
opened.
● The engine temperature is too
low.
● The charging level of the vehicle
battery is below a defined level.
● The brake vacuum is not
sufficient.
● The climate control system
requests an engine start.
● The air conditioning is manually
switched on.
If an electrical accessory, e.g. a
portable CD player, is connected to
the power outlet, a brief power drop
during the restart might be noticeable.
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