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 > Steering Pad Switch: Inspection
INSPECTION PROCEDURE 1. INSPECT STEERING PAD SWITCH ASSEMBLY (a) Measure the resistance according to the value(s) in the table below. *A w/ Lane Departure Alert System - - *1 VOLUME+ *2 VOLUME- *3 SEEK+ *4 SEEK- *5 VOICE *6 MODE HOLD *7 OFF HOOK *8 ON HOOK *9 UP *10 DOWN *11 RIGHT *12 LEFT *13 ENTER ...