Owner`s manual

140 Driving and operating
■ the driver's door is closed or the
driver's seat belt is fastened
■ the 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 not too
low
■ the defrost selection does not
inhibit an Autostop
■ the climate control system does not
inhibit an Autostop
■ the brake vacuum is sufficient
■ the self-cleaning function of the
diesel particle filter is not active
■ the vehicle has moved since the
last Autostop
An Autostop may become less
available as the ambient temperature
approaches the freezing point.
Certain settings of the climate control
system may inhibit an Autostop. See
climate control chapter for more
details.
Immediately after motorway driving
an Autostop may be inhibited.
New vehicle running-in 3 137.
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 such as auxiliary electric
heater or rear window heating are
disabled or switched into a power
saving mode. The fan speed of the
climate control system is reduced to
save power.
Restart of the engine by the
driver
Depress the clutch pedal to restart the
engine.
The engine start is indicated by the
needle at the idle speed position in
the tachometer.
If the selector lever is shifted out of
N before depressing the clutch first,
control indicator - illuminates or is
shown as a symbol in the Driver
Information Center.
Control indicator - 3 95.
Restart of the engine by the
stop-start system
The selector lever has to be in N 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
■ the driver's seat belt is unfastened
and the driver's door is opened
■ the engine temperature is too low
■ the battery is discharged
■ the brake vacuum is not sufficient