AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for HV Model): Mute Signal Circuit between Radio Receiver and Telematics Transceiver; 2021 - 2022 MY Avalon HV [08/2020

Last Modified: 08-21-2023	6.11:8.1.0	Doc ID: RM100000001RU8U
Model Year Start: 2021	Model: Avalon HV	Prod Date Range: [08/2020 - ]
Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for HV Model): Mute Signal Circuit between Radio Receiver and Telematics Transceiver; 2021 - 2022 MY Avalon HV [08/2020 - ]

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).

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.
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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.
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1.	INSPECT TELEMATICS TRANSCEIVER

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

G124-14 (MUTE) - Body ground

Power 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))

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 G124 DCM (telematics transceiver) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G2-3 (TMUT) - G124-14 (MUTE)	Always	Below 1 Ω
G2-3 (TMUT) or G124-14 (MUTE) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Disconnect the G124 DCM (telematics transceiver) connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
G124-14 (MUTE) - Body ground	Power switch on (ACC)	2.0 V or higher

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