System self-test

The 42 indicator lamp illuminates when you:

• turn the SmartKey to position 1 or 2 in the ignition lock
• on vehicles with KEYLESS-GO, press the Start/Stop button once or twice

The again after approximately six seconds. indicator lamp goes out again after approximately six seconds.

If the illuminate or is lit continuously, the system is indicator lamp does not illuminate or is lit continuously, the system is malfunctioning. Have the BabySmart™ system checked at an authorized Mercedes- Benz Center before transporting a child on the front-passenger seat.

For further information, see "Problems with air bag deactivation system".

WARNING Do not place powered-on laptops, mobile 
Do not place powered-on laptops, mobile phones, electronic tags such as those used in skipasses or similar electronic devices on the front passenger seat. Signals from such devices may interfere with the BabySmart™ air bag deactivation system. Such signal interference may cause the indicator lamp not to come on during self-test. indicator lamp not to come on during self-test.
The + SRS indicator lamp and/or the continuously lit, indicating that the system is indicator lamp could be continuously lit, indicating that the system is not functioning. The front-passenger front air bag could deploy inadvertently or fail to deploy in an accident.

    See also:

    Position of the steering wheel for driving
    The steering wheel is moved to the last selected position when: • the driver's door is closed. • you insert the SmartKey into the ignition lock. or • you press the Start/Stop button once on vehicl ...

    Useful information
    This Operator's Manual describes all models and all standard and optional equipment of your vehicle available at the time of publication of the Operator's Manual. Country-specific diffe ...

    Using the rear center seat belt
    If the left-hand rear seat backrest is folded down and back up again, the rear center seat belt may lock. The seat belt can then not be pulled out. To release the rear center seat belt: pull out ...