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 > Cargo Light Switch: Inspection
INSPECTION PROCEDURE 1. INSPECT DECK LIGHT SWITCH ASSEMBLY (a) Check the resistance. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Switch Condition Specified Condition 5 (CCTY) - 9 (CGON) Cargo light switch ON Below 1 Ω Cargo light s ...