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 > Spiral Cable: Installation
INSTALLATION PROCEDURE 1. INSPECT SPIRAL CABLE SUB-ASSEMBLY (a) Check that the spiral cable sub-assembly is center position. OK: The connector is at the top. The matchmarks are aligned. The top of the flat cable U-turn can be checked from the check window. Text in Illustration *a Check Window *b Mat ...