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- Fig. 1 Instrument cluster with driver information system: Engine stop temporarily unavailable
Applies to vehicles: with start/stop system
The on-board control system can override the start/stop function for various reasons.
Engine does not switch off
Before each stop phase, the system checks that certain conditions have been met. The engine will not switch off in the following situations, for example.
- The engine has not yet reached the minimum temperature required for start/stop mode.
- The interior temperature selected on the air conditioner* has not yet been reached.
- The exterior temperature is very high/low.
- The windscreen is being defrosted ►Link, ►Link.
- The parking aid* or park assist* is switched on.
- The neck heating* is switched on.
- The battery charge is too low.
- The steering wheel is close to full lock or the vehicle is being steered.
- Reverse gear has just been selected.
- The vehicle is on a steep gradient.
will appear in the instrument cluster display, and 
will simultaneously appear in the driver information system*.Engine cuts in again automatically
The stop phase is interrupted in the following situations, for example. The engine cuts in automatically without intervention from the driver.
Ignition is switched off automatically
To prevent the battery from being discharged, the ignition will be switched off automatically if certain conditions are met. For instance:
- The vehicle has already been driven.
- The start/stop system has switched off the engine.
- The driver's door is opened.
- The driver's seat belt is unbuckled.
- The brake pedal is not pressed.
- The vehicle is stationary.
If the dipped beam headlights are on when this happens, the side lights will be turned on instead and the message Side lights will be automatically switched off in 30 minutes. See owner's manual will appear on the instrument cluster display. After approx. 30 minutes, or when you lock the vehicle, the side lights will be switched off.
If the start/stop system has not stopped the engine or if you have switched off the start/stop system manually, the engine will continue running and the ignition will not be switched off automatically WARNING!.
Note
If you select D, N or S (on vehicles with automatic gearbox) after selecting reverse gear, the car must have been moving at over 10 km/h before the system can switch off the engine again.