Toyota 2009 Tacoma User Manual page 255

3-2. Using the audio system
Operating portable audio devices connected to the audio system
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The volume can be adjusted using the vehicle's audio controls. All other
adjustments must be made on the portable audio device itself.
When using a portable audio device connected to the power outlet or
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cigarette lighter
Noise may occur during playback. Use the power source of the portable
audio device.
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