The start/stop function reduces fuel consumption, which in turn can contribute to an environmentally conscious driving style and reduced emissions.
- the driver has not fastened the seatbelt
- the car has not been able to reach a speed of approx. 10 km/h (6 mph) after starting, or the function has been activated a number of times successively
- the engine has not reached normal operating temperature
- the windscreen’s electric heating is activated
- the environment in the passenger compartment deviates from the set values
- the driver is making large steering wheel movements
- the road is very steep
- the bonnet is opened
- the ABS system has been activated
- in the event of heavy braking (even without the ABS system having been activated)
- the capacity of the starter battery has fallen below the minimum permissible level
- many starts during a short period of time have activated the starter motor’s thermal protection
- the exhaust system’s particulate filter is full
- a trailer is connected to the car’s electrical system.
- the driver has not fastened the seatbelt
- gear position P is engaged and the driver door is open.
- high humidity in the passenger compartment forms misting on the windows
- the environment in the passenger compartment deviates from the set values
- repeated pumping of the brake pedal
- the bonnet is opened
- the capacity of the starter battery has fallen below the minimum permissible level
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- the driver’s seatbelt is unbuckled and the gear selector is in position D or N
- the gear selector is moved from position D to position R or M
- the driver door is opened with the gear selector in position D.
Activating and deactivating the start/stop function
The start/stop function is available when the car is started. When the function is activated, the engine is switched off temporarily. The engine then starts automatically when the function is deactivated or when the car requires this.
Activating the start/stop function
Depress and hold the brake pedal depressed.
The start/stop function is activated and the engine is switched off.
- In Comfort or Eco drive mode, the start/stop function is activated before the car is completely stationary.
- When adaptive cruise control or Pilot Assist is activated, the start/stop function is activated for a few seconds after the car is completely stationary.
However, some equipment may have temporarily reduced function, such as the climate control’s fan speed or loudspeaker volume.
Deactivating the start/stop function
Release the brake pedal or gently depress the accelerator pedal.
The start/stop function is deactivated and the engine starts.
- the function for automatic braking when stationary (Auto hold) is activated, start of the engine is delayed until the accelerator pedal is depressed
- adaptive cruise control or Pilot Assist is activated, the engine starts when the accelerator pedal is depressed or by pressing the
- the car is facing uphill, hill start assist (HSA) engages to prevent the car from rolling backwards
- the car is facing downhill, release the brake pedal slightly. A small increase in speed starts the engine.
Settings in the centre display
The centre display shows whether the function is available or deactivated.
Illuminated indication: the start/stop function is available.
Extinguished indication: the start/stop function is deactivated.
Symbols in the driver display
The driver display’s tachometer indicates when the start/stop function is available, active or unavailable.
| Symbol | Specification |
|---|---|
| White – the function is available. | |
| Green – the function is activated. | |
| Grey – the function is not available. |
If no symbol is shown in the driver display, the function is disabled.