PROCEDURE
(a) Set treble, middle and bass to the initial values and check that the sound is normal. OK: Malfunction disappears. HINT: Sound quality adjustment measures vary according to the type of amplifier.
(a) Compare with another vehicle of the same model which does not have trouble to see if there is any difference in the sound quality. OK: No difference is found.
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Toyota Tundra Service Manual > Can Communication System: Navigation ECU Communication Stop Mode
DESCRIPTION Detection Condition Symptoms Trouble Area Navigation ECU Communication Stop Mode Any of the following conditions are met: Communication stop for "Display and Navigation (AVN)" is indicated on the "Communication Bus Check" screen of the Techstream. Communication system DTCs (DTCs that sta ...
