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 > Clearance Sonar Main Switch: Inspection
INSPECTION PROCEDURE 1. INSPECT BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY (a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Switch Condition Specified Condition 7 (IG) - 8 (SK) Sonar switch off 10 kΩ or higher Sonar switch on Below 1 ...
