Toyota Avalon (XX50): 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

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Audio, Visual, Telematics / Audio / Video / Audio And Visual System(for Gasoline Model) / 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

Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

DESCRIPTION

This circuit sends a signal to the stereo component amplifier assembly to mute noise. Because of that, the noise produced by changing the sound source ceases.

If there is an open in the circuit, noise can be heard from the speakers when changing the sound source.

If there is a short in the circuit, even though the stereo component amplifier assembly is functioning normally, no sound or only an extremely faint sound can be heard.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.
Click here
When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
- A communication malfunction DTC may be stored.
- The radio and display receiver assembly may not operate normally.

PROCEDURE

1.	INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

G8-1 (MUTE) - Body ground

Engine switch on (ACC), audio system playing

→ Changing modes

2.0 V or higher

→ Below 1 V

*a	Component with harness connected (Stereo Component Amplifier Assembly)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)

(a) Disconnect the G3 radio and display receiver assembly connector.

(b) Disconnect the G8 stereo component amplifier assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G3-25 (MUT1) - G8-1 (MUTE)	Always	Below 1 Ω
G3-25 (MUT1) or G8-1 (MUTE) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (OUTPUT SIGNAL)

(a) Reconnect the G8 stereo component amplifier assembly connector.

(b) Disconnect the G3 radio and display receiver assembly connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
G3-25 (MUT1) - Body ground	Engine switch on (ACC), audio system is playing	2.0 V or higher

*a	Front view of wire harness connector (to Radio and Display Receiver Assembly)

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

Mute Signal Circuit between Radio Receiver and Telematics Transceiver

DESCRIPTION

The DCM (telematics transceiver) sends a mute signal to the radio and display receiver assembly.

The radio and display receiver assembly controls the volume according to the mute signal from the DCM (telematics transceiver).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.
Click here
When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
- A communication malfunction DTC may be stored.
- The radio and display receiver assembly may not operate normally.
Before replacing the DCM (telematics transceiver), refer to Registration.
Click here

PROCEDURE

1.	INSPECT DCM (TELEMATICS TRANSCEIVER)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

G9-17 (MUTE) - Body ground

Engine switch on (ACC)

Audio system playing

→ Emergency call mode

2.0 V or higher

→ Below 1 V

*a	Component with harness connected (DCM (Telematics Transceiver))

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER))

(a) Disconnect the G2 radio and display receiver assembly connector.

(b) Disconnect the G9 DCM (telematics transceiver) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G2-3 (TMUT) - G9-17 (MUTE)	Always	Below 1 Ω
G2-3 (TMUT) or G9-17 (MUTE) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Disconnect the G9 DCM (telematics transceiver) connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
G9-17 (MUTE) - Body ground	Engine switch on (ACC)	2.0 V or higher

*a	Front view of wire harness connector (to DCM (Telematics Transceiver))

REPLACE DCM (TELEMATICS TRANSCEIVER)

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

Mute Signal Circuit between Stereo Component Amplifier and Telematics Transceiver

DESCRIPTION

The DCM (telematics transceiver) sends a mute signal to the stereo component amplifier assembly.

The stereo component amplifier assembly controls the volume according to the mute signal from the DCM (telematics transceiver).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.
Click here
Before replacing the DCM (telematics transceiver), refer to Registration.
Click here

PROCEDURE

1.	INSPECT DCM (TELEMATICS TRANSCEIVER)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

G9-17 (MUTE) - Body ground

Engine switch on (ACC)

Audio system playing

→ Emergency call mode

2.0 V or higher

→ Below 1 V

*a	Component with harness connected (DCM (Telematics Transceiver))

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER))

(a) Disconnect the G8 stereo component amplifier assembly connector.

(b) Disconnect the G9 DCM (telematics transceiver) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G8-24 (TMUT) - G9-17 (MUTE)	Always	Below 1 Ω
G8-24 (TMUT) or G9-17 (MUTE) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

(a) Disconnect the G9 DCM (telematics transceiver) connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
G9-17 (MUTE) - Body ground	Engine switch on (ACC)	2.0 V or higher

*a	Front view of wire harness connector (to DCM (Telematics Transceiver))

REPLACE DCM (TELEMATICS TRANSCEIVER)

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

Microphone Circuit

No Sound can be Heard from Speakers. Noise Occurs or Sound Skips when Portable Player Plays. Noise Occurs

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Maintenance: Brake Fluid(for Hv Model)
Components COMPONENTS ILLUSTRATION *1 BRAKE MASTER CYLINDER RESERVOIR FILLER CAP ASSEMBLY - - ILLUSTRATION *1 FRONT DISC BRAKE BLEEDER PLUG *2 FRONT DISC BRAKE BLEEDER PLUG CAP *3 REAR DISC BRAKE BLEEDER PLUG *4 REAR DISC BRAKE BLEEDER PLUG CAP Tightening torque for "Major areas involving basic vehi ...