CAUTION / NOTICE / HINT HINT: When the "iPhone" is connected to the USB port of the No. 1 stereo jack adapter, Entune audio may not be output. Before performing troubleshooting, disconnect the "iPhone" connected to the USB port of the No. 1 stereo jack adapter, change the audio output source of the "iPhone" or turn the ignition switch off and then ON again. PROCEDURE
(a) In sound output setting mode, set volume, fader and balance to the initial values and check that the sound is normal. OK: Audio system returns to normal. HINT: Sound quality adjustment measures vary according to the type of amplifier.
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Toyota Tundra Service Manual > Navigation System: Mute Signal Circuit between Navigation Receiver Assembly and Stereo Component Amplifier
DESCRIPTION This circuit sends a signal to the stereo component amplifier assembly to mute noise. Because of that, the noise produced by changing the sound source ceases. If there is an open in the circuit, noise can be heard from the speakers when changing the sound source. If there is a short in t ...