2012 Toyota 4Runner Navigation Manual - Page 274

AUDIO SYSTEM Push these buttons or tabs if you want to switch from one mode to another. If the disc is not set, the CD changer does not turn on. You can turn off the CD changer by ejecting all the discs. If the audio system was previously off, then the entire audio system will be turned off when you eject all the discs. If the other function was previously playing, it will come on again. 150