Toyota Avalon Service & Repair Manual: Mute Signal Circuit between Radio Receiver and Telematics Transceiver

Toyota Avalon Service & Repair Manual / Audio, Visual, Telematics / Audio / Video / Audio And Visual System(for Gasoline Model) / 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.

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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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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))

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

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.

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

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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))

OK

REPLACE DCM (TELEMATICS TRANSCEIVER)

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

    Mute Signal Circuit between Stereo Component Amplifier and Telematics Transceiver

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