Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001RUJB
Model Year Start: 2021 Model: Avalon HV Prod Date Range: [08/2020 -           ]
Title: NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM (for HV Model): Mute Signal Circuit between Stereo Component Amplifier and Telematics Transceiver; 2021 - 2022 MY Avalon HV [08/2020 -        ]

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 Navigation System.

    Click here 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]; NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM (for HV Model): PRECAUTION 2022 MY Avalon HV [08/2021 -        ]; NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM (for HV Model): PRECAUTION

  • Before replacing the DCM (telematics transceiver), refer to Registration.

    Click here 2021 - 2022 MY Avalon HV [08/2020 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

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

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))
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

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

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

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

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

G8-24 (TMUT) - G124-14 (MUTE)

Always

Below 1 Ω

G8-24 (TMUT) or G124-14 (MUTE) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

INSPECT STEREO COMPONENT AMPLIFIER 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))
OK

REPLACE DCM (TELEMATICS TRANSCEIVER)

NG

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; AUDIO / VIDEO: STEREO COMPONENT AMPLIFIER: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; AUDIO / VIDEO: STEREO COMPONENT AMPLIFIER: REMOVAL