12 Infotainment systemWhen the Infotainment system isswitched on, the last selected volumeis set, if that volume is lower than themaximum start up volume.The following can be set separately:■ the maximum start up volume (onlyCD 300 / CD 400 / CDC 400)3 21■ the volume of the trafficannouncements 3 21■ the volume of the navigationmessages (only CD 500 /DVD 800) 3 51Speed compensated volumeWhen speed compensated volume isactivated 3 21 the volume isadapted automatically to make up forthe road and wind noise as you drive.MutePress the PHONE button (if Phoneportal available: press for a fewseconds) to mute the audio sources.To cancel mute again: turn the Xknob or press the PHONE buttonagain (if Phone portal available: pressfor a few seconds).Volume limitation at hightemperatures(only CD 300 / CD 400 / CDC 400)At very high temperatures inside thevehicle the Infotainment system limitsthe maximum adjustable volume. Ifnecessary the volume is decreasedautomatically.Modes of operationRadioPress the RADIO button to open theradio main menu or to changebetween the different wavebands.Press the multifunction knob to opena submenu with options for stationselection.Detailed description of the radiofunctions 3 23.Audio playersPress the CD / AUX / CD/AUX buttonto open the CD, USB, iPod or AUXmenu (if available) or to swapbetween these menus.Press the multifunction knob to opena submenu with options for trackselection.CD 500 / DVD 800Detailed description of:■ CD/DVD player functions 3 40■ AUX input functions 3 45■ USB port functions 3 45CD 300 / CD 400 / CDC 400Detailed description of:■ CD player functions 3 40■ AUX input functions 3 45■ USB port functions (not withCD 300) 3 45Navigation(only CD 500 / DVD 800)Press NAVI button twice to open theNavigation menu.Detailed description of the navigationsystem functions 3 51.Phone(if Phone portal available)Press the PHONE button to open thetelephone menu.Press the multifunction knob to opena submenu with options for the inputor selection of numbers.