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 > Ignition Switch: Inspection
INSPECTION PROCEDURE 1. INSPECT IGNITION SWITCH ASSEMBLY (a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Switch Condition Specified Condition All terminals LOCK 10 kΩ or higher 2 (ACC) - 4 (AM1) ACC Below 1 Ω 1 (IG1) - 4 (AM1) ON 2 (A ...