PROCEDURE
(a) Set treble, middle and bass to the initial values and check that the sound is normal. OK: The sound returns to normal.
(a) Compare with another vehicle of the same model which is not malfunctioning to see if there is any difference in the sound quality. OK: No difference is found.
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Toyota Tundra Service Manual > Navigation System: LVDS Signal Malfunction (from Extension Module) (B1532,B156C)
DESCRIPTION DTC Code DTC Detection Condition Trouble Area B1532 When either condition below is met: Video signal (digital) is lost. The stereo component tuner assembly is not connected while the ignition switch is ON or ACC. Communication between the navigation receiver assembly and the stereo compo ...