COMPONENTS ILLUSTRATION 
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Navigation System(for Gasoline Model): Poor Sound Quality in All Modes (Low Volume)
PROCEDURE 1. CHECK AUDIO SETTINGS (a) Set treble, middle and bass to the initial values and check that the sound is normal. OK: The sound returns to normal. HINT: Sound quality adjustment measures vary according to the type of amplifier. OK END NG 2. COMPARE WITH ANOTHER VEHICLE OF SAME MODEL (a) Co ...
