2009 Toyota 4Runner Owners Manual - Page 293

3-2. Using the audio system Type A and B Press . Type C Press . n Operating portable audio devices connected to the audio system The volume can be adjusted using the vehicle's audio controls. All other adjustments must be made on the portable audio device itself. n When using a portable audio device connected to the power outlet Noise may occur during playback. Use the battery power source of the portable audio device to reduce noise. 270