Toyota Avalon Service & Repair Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

  • Before checking parts for malfunctions, check that the audio system operates normally.
  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.

HINT:

Removing dealer installed options and optional components before performing diagnosis makes it easier to determine the location of a malfunction.

Active Noise Control System

Symptom

Suspected Area

Link

Muffled engine sounds in cabin

Proceed to "Power Source Circuit"

Proceed to "Input / Output Signal Circuit"

Front No. 1 speaker assembly LH

Front No. 1 speaker assembly RH

Rear No. 3 speaker assembly

Harness or connector

-

Stereo component equalizer assembly

Stereo component amplifier assembly

Abnormal noise from speakers

Front No. 1 speaker assembly LH

Front No. 1 speaker assembly RH

Rear No. 3 speaker assembly

Harness or connector

-

Stereo component equalizer assembly

Stereo component amplifier assembly

    Precaution

    System Description

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    PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each system by checking the suspected a ...

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    Toyota Avalon Service & Repair Manual

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