Toyota Avalon (XX50): No Sound can be Heard from Speakers. Noise Occurs or Sound Skips when Portable Player Plays. Noise Occurs

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Audio, Visual, Telematics / Audio / Video / Audio And Visual System(for Gasoline Model) / No Sound can be Heard from Speakers. Noise Occurs or Sound Skips when Portable Player Plays. Noise Occurs

No Sound can be Heard from Speakers

PROCEDURE

1.	CHECK AUDIO SETTINGS

(a) In sound output setting mode, set volume, fader and balance to the initial values and check that the sound is normal.

OK:

Audio system returns to normal.

HINT:

Sound quality adjustment measures vary according to the type of amplifier.

END

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Noise Occurs or Sound Skips when Portable Player Plays

CAUTION / NOTICE / HINT

HINT:

Perform this check with the portable player volume set at an appropriate level.
Make sure that there are no obstructions between the portable player and the radio and display receiver assembly that may block signals, and that the portable player and the radio and display receiver assembly are not excessively far apart.
Make sure that devices other than the radio and display receiver assembly are not connected to the portable player.
Make sure that there is no interference from a wireless LAN, etc.

PROCEDURE

1.	CHECK USING ANOTHER "Bluetooth" AUDIO COMPATIBLE VEHICLE OF SAME MODEL

(a) Check that the same problem does not occur in the sound heard from the speakers of another "Bluetooth" audio compatible vehicle of the same model.

OK:

The same problem does not occur in the sound heard from the speakers.

MALFUNCTION IN PORTABLE PLAYER

2.	REMOVE ADDITIONAL DEVICES WHICH USE RADIO WAVES

(a) Remove additional devices which use radio waves.

(b) Play the portable player and check that the same problem does not occur in the sound heard from the speakers.

OK:

The same problem does not occur in the sound heard from the speakers.

END

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Noise Occurs

PROCEDURE

1.	CHECK NOISE CONDITION

(a) Check from which direction the noise comes (front left or right, or rear left or right).

OK:

The location of the noise source can be determined.

GO TO STEP 3

2.	CHECK SPEAKERS

(a) Check the installation condition of the speaker units that are located near the noise source and that there are no cracks, scratches, deformation or other failures.

Result	Proceed to
No malfunction is found.	A
A speaker is installed incorrectly.	B
Foreign matter is in a speaker.	C
A speaker cone paper is broken.	D

REINSTALL SPEAKER

REMOVE FOREIGN MATTER

REPLACE SPEAKER

3.	CHECK NOISE CONDITIONS

(a) Check the noise condition.

HINT:

The radio has a noise prevention function to reduce noise when listening to the radio. If a loud noise occurs, check whether the ground at the antenna mounting base and the noise prevention unit are installed and wired correctly.

Condition under which Noise Occurs	Noise Source
Noise increases when the accelerator pedal is depressed, but stops when the engine is stopped.	Generator
Noise occurs during A/C or heater operation.	Blower motor
Noise occurs when the horn switch is pressed and released or when pressed and held.	Horn
Noise occurs synchronously with the turn signal blinking pattern.	Flasher
Noise occurs during window washer operation.	Washer
Noise occurs during wiper operation.	Wiper
Noise occurs when the brake pedal is depressed.	Stop light switch
Others	Static electricity

HINT:

In the left column of the table, find the situation that matches the customer's complaint. Then, in the right column, find the part that is causing the noise. Check the respective noise filter.
To save time and avoid a misdiagnosis, first make sure that the noise is not coming from outside the vehicle.
Troubleshoot noises in descending order of loudness.
Setting the radio to a frequency where no signal is received may make recognition of the noise problem easier.

Result	Proceed to
The noise source cannot be determined.	A
The noise source can be determined.	B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE NOISE SOURCE

Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier. Mute Signal Circuit between Radio Receiver and Telematics Transceiver. Mute Signal Circuit between Stereo Component Amplifier

Operation Check

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