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Auto Start/Stop function
The concept
The Auto Start/Stop function helps save fuel.
The system switches off the engine during a
stop, e.g., in a traffic congestion or at traffic
lights. The ignition remains switched on. The
engine starts again automatically for driving off.
Certain vehicle components may experience
additional wear as a result of this system.
Automatic mode
The Auto Start/Stop function is operational after
each engine start.
This function is activated at speeds faster than
about 3 mph, approx. 5 km/h.
Engine stop
The engine is switched off automatically during
a stop under the following conditions:
Automatic transmission:
▷ The selector lever is in transmission position
D.
▷ The brake pedal remains pressed while the
vehicle is stationary or the vehicle is held by
Automatic Hold.
▷ The driver's seat belt is buckled or the driv‐
er's door is closed.
The air volume of the air conditioner is reduced
when the engine is switched off.
Displays in the instrument cluster
The display indicates that the au‐
tomatic engine start-stop func‐
tion is ready for an automatic en‐
gine start.
The display indicates that the
conditions for an automatic en‐
gine stop have not been satisfied.
Note
The engine is not switched off automatically in
the following situations:
▷ External temperature below approx.
+37 ℉/+3 ℃.
▷ The external temperature is high and auto‐
matic climate control is running.
▷ The passenger compartment has not yet
been heated or cooled to the required level.
▷ The engine is not yet at operating tempera‐
ture.
▷ The wheels are at a sharp angle or the steer‐
ing wheel is being turned.
▷ After driving in reverse.
▷ Fogging of the windows when the automatic
climate control is switched on.
▷ The vehicle battery charge is very low.
▷ The engine compartment lid is unlocked.
▷ HDC is activated.
▷ The parking assistant is activated.
▷ Stop-and-go traffic.
▷ The transmission selector lever is in position
N or S/M.
Starting the engine
The engine starts automatically under the fol‐
lowing conditions:
▷ Automatic transmission:
By releasing the brake pedal.
When Automatic Hold is activated: press the
accelerator.
After the engine starts, accelerate as usual.
Safety mode
After the engine switches off automatically, it
will not start again automatically if any one of the
following conditions are met.
▷ The driver's safety belt is unbuckled and the
driver's door is open.
▷ The hood was unlocked.
Seite 68
Controls Driving
68
Online Edition for Part no. 01 40 2 916 693 - X/12
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