Instruments and controls 87Adjusting contrast(Graphic-Info-Display)Select menu item Contrast from theSettings menu.Confirm the required setting.Setting display modeDisplay brightness is dependent onvehicle lighting. Additional settingscan be made as follows:Select menu item Day / Night from theSettings menu.Automatic The colours are adapted tothe exterior lights.Always day design black or colouredtext on light background.Always night design white or colouredtext on dark background.Selection is indicated by a o in frontof the menu item.Ignition logicSee Infotainment system manual.Smartphone controllerThe smartphone controller allows asmartphone to access vehicle datavia WLAN or Bluetooth connection.This data can then be displayed andanalysed on the smartphone.Vehicle messagesMessages are given via theinstrument panel display or aswarning and signal buzzers. Checkcontrol messages appear on theInfo-Display. Some appear in anabbreviated form. Confirm warningmessages with the multifunction knob3 84.Warning chimesWhen starting the engine orwhilst driving■ If seat belt is not fastened.■ If a door or the tailgate is not fullyclosed when starting-off.■ If a certain speed is exceeded withthe parking brake applied.■ If the speed programmed at thefactory is exceeded.■ If the vehicle has manualtransmission automated and thedriver's door is opened when the