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

Toyota Avalon Service & Repair Manual > Audio And Visual System(for Hv Model): Main Body ECU Vehicle Information Reading/Writing Process Malfunction (B15F6)
DESCRIPTION This DTC is stored when items controlled by the main body ECU (multiplex network body ECU) cannot be customized via the audio and visual system vehicle customization screen. HINT: The main body ECU (multiplex network body ECU) controls the items for the following systems that are customi ...

Toyota Avalon Owners Manual