Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Mute Signal Circuit between Stereo Component Amplifier and Telematics Transceiver

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Audio & Visual & Telematics / Audio / Video / Audio And Visual System (for 8 Inch Display) / 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

J157-14 (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 (STEREO COMPONENT AMPLIFIER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER))

(a) Disconnect the J156 stereo component amplifier assembly connector.

(b) Disconnect the J157 DCM (telematics transceiver) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J156-24 (TMUT) - J157-14 (MUTE)

Always

Below 1 Ω

J156-24 (TMUT) or J157-14 (MUTE) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

3.

INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

(a) Reconnect the J156 stereo component amplifier assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

J157-14 (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 STEREO COMPONENT AMPLIFIER ASSEMBLY

    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. Due to this, the noise produced by changing the sound source ceases. If there is an open in the circui ...

    AVC-LAN Circuit
    DESCRIPTION Each unit of the audio and visual system connected to the AVC-LAN (communication bus) transmits signals via AVC-LAN communication. If a short to +B or short to ground occurs in an AVC-LAN ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Sfi System: Camshaft Position "B" - Actuator Bank 1 Circuit Open (P001313,P002313)
    DESCRIPTION The Variable Valve Timing (VVT) system adjusts the exhaust valve timing to improve driveability. The engine oil pressure turns the VVT controller to adjust the valve timing. The cam timing oil control solenoid assembly operates according to signals received from the ECM to control the po ...

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Rear Wiper Motor: On-vehicle Inspection
    ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT REAR WIPER MOTOR AND BRACKET ASSEMBLY *A w/o Rear No. 2 Seat *B w/ Rear No. 2 Seat *a Alignment Mark - - (a) Operate the rear wiper motor and bracket assembly. (b) Stop the rear wiper motor and bracket assembly operation. (c) Check th ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2025 Copyright www.lexusrx.net
    0.0144