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Switching on drive-ready state
Steptronic transmission
1. Depress the brake pedal.
2. Press the Start/Stop button.
The ignition is activated automatically for a brief
time and is stopped as soon as the engine starts.
Most of the indicator/warning lights in the instru‐
ment cluster light up for a varied length of time.
Gasoline engine
Depending on the motorization, the full drive
power may not be available for approximately
30 seconds after starting the engine. In this case,
the vehicle will not accelerate as usual.
Display in the instrument cluster
When drive-ready state is switched on, the tach‐
ometer shows the current engine speed.
Switching off drive-ready state
Steptronic transmission
1.
Engage selector lever position P with the ve‐
hicle stopped.
2. Press the Start/Stop button.
The engine is switched off.
3. Set the parking brake.
Auto Start/Stop function
Concept
The Auto Start/Stop function helps save fuel.
The system switches off the engine during a
stop, for instance in traffic congestion or at traffic
lights. Drive-ready state remains switched on.
The engine starts automatically for driving off.
General information
After each engine start using the Start/Stop but‐
ton, the Auto Start/Stop function is ready. The
function is activated from speeds of approx.
3 mph/5 km/h.
Depending on the selected driving mode, refer to
page 137, the system is automatically activated
or deactivated.
Engine stop
Functional requirements
Steptronic transmission
The engine is switched off automatically during a
stop under the following conditions:
▷ The selector lever is in selector lever position
D.
▷ The brake pedal remains pressed while the
vehicle is stationary or the vehicle is held by
Automatic Hold.
▷ The driver's safety belt is buckled or the driv‐
er's door is closed.
Steptronic transmission: manual
engine stop
If the engine was not switched off automatically
when the vehicle stopped, the engine can be
switched off manually:
▷ Press the brake pedal forcefully again from
the current pedal position.
▷ Engage selector lever position P.
If all functional preconditions are fulfilled, the en‐
gine switches off.
Air conditioner when the engine is
switched off
The air flow from the air conditioner is reduced
when the engine is switched off.
Seite 121
Driving
CONTROLS
121
Online Edition for Part no. 01402720839 - II/19
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