2011 Mercedes R-Class Owner's Manual - Page 52

50 Occupant safety System self-test The 42 indicator lamp illuminates when you: the SmartKey to position 1 or 2 in the ignition lock Ron vehicles with KEYLESS-GO, press the Start-Stop button once or twice The 42 indicator lamp goes out again after approximately six seconds. If the 42 indicator lamp does not illuminate or is lit continuously, the system is malfunctioning. Before transporting a child on the front-passenger seat, have the BabySmart™ system checked at an authorized Mercedes-Benz Center. For more information, see "Problems with the air bag deactivation system" section (Y page 51) Rturn Safety G Warning Do not place powered-on laptops, mobile phones, electronic tags such as those used in ski passes 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 42 indicator lamp not to come on during self-test. The + SRS indicator lamp and/or the 42 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.