PROCEDURE
(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.
(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 Avalon Service & Repair Manual > Air Conditioning System(for Gasoline Model): Compressor Solenoid Circuit (B1451)
DESCRIPTION The cooler compressor assembly receives refrigerant compression demand signals from the air conditioning amplifier assembly. Based on this signal, the cooler compressor assembly changes the amount of compressor output. DTC No. Detection Item DTC Detection Condition Trouble Area Memory B1 ...