The Auto Start/Stop function helps save fuel. The system switches off the engine during a stop, for instance in traffic jam or at traffic lights. Drive-ready state remains switched on. The engine starts automatically for driving off.
After each engine start using the Start/Stop button, 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, 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 depressed while the vehicle is at a standstill or the vehicle is held by Automatic Hold.
- The driver's seat belt is buckled or the driver'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:
- Depress the brake pedal forcefully again from the current pedal position.
- Engage selector lever position P.
When all functional preconditions are fulfilled, the engine switches off.
Starting the engine: Functional requirements
Steptronic transmission
The engine starts automatically under the following preconditions:
- By releasing the brake pedal.
- When Automatic Hold is activated: step on the accelerator pedal.
Activating/deactivating the system manually
The engine is not automatically switched off.
The engine is started during an automatic engine stop.
Via button: Push the Auto Start/Stop button on the center console to activate or deactivate Auto Start/Stop
Via selector lever position: The Auto Start/Stop function is also deactivated in selector lever position M/S.
Via the Driving Experience Control: The Auto Start/Stop function is also deactivated in SPORT driving mode of the Driving Experience Control.
Display
- LED is illuminated: Auto Start/Stop function is deactivated.
- LED goes out: Auto Start/Stop function is activated.
Switching off the vehicle during an automatic engine stop
During an automatic engine stop, the vehicle can be switched off permanently, for instance when leaving it.
Steptronic transmission
1. Press the Start/Stop button.
- Drive-ready state is switched off.
- Standby state is switched on.
- Selector lever position P is engaged automatically.
2. Set the parking brake.
Automatic deactivation: In certain situations, the Auto Start/Stop function is deactivated automatically for safety reasons, for instance if no driver is detected.
